When someone is 불성실하다 (bulseongsilhada), it means they are not diligent or sincere in their actions. It describes a lack of faithfulness or commitment to a task, a promise, or even a relationship.
For example, if a student doesn't do their homework regularly, they could be described as 불성실하다. Or, if someone is not serious about their work, they are 불성실하다. It implies a sense of being unreliable or not putting in enough effort.
When using 불성실하다 (bulseongsilhada) in everyday Korean, you're essentially saying someone isn't putting in the effort or isn't being genuine. It often describes a lack of diligence, like a student who doesn't study or an employee who doesn't do their work properly. You might also hear it used to describe someone who is unfaithful in a relationship, showing a lack of sincerity or commitment. So, if someone is behaving in a way that suggests they're not serious or committed, 불성실하다 is a good word to use.
When someone is 불성실하다 (bulseongsilhada), it means they lack diligence, sincerity, or faithfulness. This adjective is used to describe a person's attitude or behavior when they are not putting in enough effort, are not genuine, or are not keeping their commitments.
For instance, a student who doesn't study for exams could be described as 불성실한 학생 (bulseongsilhan haksaeng - an insincere/undiligent student). Similarly, if an employee consistently misses deadlines, they might be considered 불성실한 직원 (bulseongsilhan jigwon - an undiligent employee).
It implies a negative judgment on someone's work ethic, commitment to a task, or trustworthiness in relationships.
§ Understanding 불성실하다
The Korean word 불성실하다 (bulseongsilhada) is an adjective. It describes someone or something that lacks diligence, sincerity, or faithfulness. Think of it as the opposite of being 성실하다 (seongsilhada), which means diligent or sincere. This word is really useful for talking about people's work ethic, their promises, or their general attitude towards responsibilities.
- Korean Word
- 불성실하다 (불성실하다)
- Type
- Adjective
- CEFR Level
- A2
- Definition
- Not diligent or sincere; unfaithful.
§ How to Use It in a Sentence
Since 불성실하다 is an adjective, it will conjugate like other descriptive verbs in Korean. Here are the common ways you'll use it:
- Describing a noun: You can attach -은/는 to the stem to modify a noun. Since the stem ends in 하다, it becomes 불성실한.
- As a predicate: You can use it as the main verb of a sentence.
Let's look at some examples to make this clear.
그는 일에 불성실해서 해고당했어요.
- Translation hint
- He was fired because he was insincere at work.
In this example, 불성실해서 uses the -아/어서 connective ending to show cause or reason. It means "because he was insincere."
불성실한 태도는 좋지 않아요.
- Translation hint
- An insincere attitude is not good.
Here, 불성실한 directly modifies the noun 태도 (taedo), meaning "attitude." So, it's an "insincere attitude."
그 학생은 숙제를 자주 안 해서 불성실하다고 선생님께 지적받았어요.
- Translation hint
- That student was pointed out by the teacher as being undiligent because they often didn't do their homework.
In this case, 불성실하다고 uses the -(이)라고 하다 pattern, which is used for indirect quotation or to say something is called a certain way. Here, it means "was referred to as insincere/undiligent."
§ Related Vocabulary
To get a better grasp of 불성실하다, it helps to know its opposite and related terms:
- 성실하다 (seongsilhada): Diligent, sincere, faithful. This is the direct opposite.
- 게으르다 (geeureuda): Lazy. While similar, 불성실하다 emphasizes a lack of sincerity or faithfulness, whereas 게으르다 is more about a lack of effort or being idle. A person can be diligent but still insincere in their efforts, for example.
- 무책임하다 (muchegimhada): Irresponsible. This can be a result of being 불성실하다.
§ Common Situations to Use It
You'll often hear or use 불성실하다 when talking about:
- Work ethic: Describing an employee who doesn't do their best or is unreliable.
- Academic performance: A student who doesn't put in enough effort or skips assignments.
- Relationships: Someone who is unfaithful or not sincere in their promises.
- General attitude: A person who approaches tasks or life with a lack of commitment.
그는 약속에 대해 너무 불성실해요.
- Translation hint
- He is too unfaithful/insincere when it comes to promises.
§ What 불성실하다 means
The Korean adjective 불성실하다 (bulseongsilhada) describes someone or something that is not diligent, not sincere, or unfaithful. It's often used to point out a lack of effort, dedication, or honesty.
- Korean Word
- 불성실하다
- Pronunciation
- [bul-seong-sil-ha-da]
- Part of Speech
- Adjective
- Definition
- Not diligent or sincere; unfaithful.
§ Where you'll hear 불성실하다
You'll often encounter 불성실하다 in everyday conversations, especially in contexts related to work, school, or even in news reports when discussing someone's conduct or performance. It’s a useful word for describing a lack of responsibility or commitment.
Workplace: If an employee isn't putting in enough effort, is frequently late, or doesn't follow through on tasks, they might be described as 불성실하다.
School: Students who don't do their homework, skip classes, or don't study for exams can be considered 불성실하다 by their teachers or peers.
News/Public life: When public figures or officials are accused of neglecting their duties or being dishonest, news reports might use this word to describe their actions.
Relationships: While less common than for work or school, it can also describe someone who is not faithful or sincere in a personal relationship, though other words like 바람둥이 (player/cheater) are more direct for infidelity.
§ Examples of 불성실하다 in use
Let's look at some examples to see how 불성실하다 is used in different sentences:
그는 일에 불성실하다는 평가를 받았다. (He received an evaluation that he was not diligent in his work.)
시험에 불성실한 태도로 임하면 좋은 결과를 얻을 수 없다. (If you approach the exam with an insincere attitude, you cannot get good results.)
그 선수는 훈련에 불성실해서 결국 팀에서 방출되었다. (That athlete was not diligent in training, so he was eventually released from the team.)
그녀는 맡은 임무에 불성실하여 많은 사람들에게 실망을 주었다. (She was unfaithful to her assigned duties and disappointed many people.)
Understanding 불성실하다 will help you express and comprehend situations where dedication and sincerity are lacking. Keep practicing with these examples, and you'll master it in no time!
§ Understanding the Nuances of "불성실하다"
When you're learning a new language, especially one like Korean that has many subtle distinctions, it's easy to make mistakes. "불성실하다" is one of those words that can trip up learners if they don't grasp its full meaning. It's not just about being "not diligent"; it carries connotations of lacking sincerity, faithfulness, or even being irresponsible. Let's look at some common mistakes and how to avoid them.
§ Mistake 1: Confusing "불성실하다" with just "lazy"
Many learners initially translate "불성실하다" simply as "lazy." While someone who is "불성실하다" might also be lazy, the words aren't interchangeable. "Lazy" (게으르다) often implies a lack of desire to work or exert effort. "불성실하다" goes a step further, suggesting a failure to fulfill one's duties, commitments, or responsibilities, often due to a lack of earnestness or care. It's about not being faithful to one's obligations.
그 학생은 불성실해서 항상 숙제를 안 해요. (That student is unfaithful/undiligent, so they always don't do their homework.)
나는 너무 게을러서 운동을 시작할 수가 없어. (I'm too lazy to start exercising.)
§ Mistake 2: Using it for trivial or one-time incidents
"불성실하다" usually describes a consistent pattern of behavior or a deeply ingrained trait. It's generally not used for a single, minor oversight or a one-off mistake. If someone forgets something just once, or makes a small error, you wouldn't typically call them "불성실하다." It's reserved for situations where there's a repeated lack of commitment or a significant dereliction of duty.
그는 중요한 약속을 계속 불성실하게 어겼다. (He faithlessly/undiligently kept breaking important promises.)
You wouldn't say:
나는 어제 가방을 잃어버려서 불성실하다. (I lost my bag yesterday, so I am undiligent.)
Instead, you might say:
나는 어제 가방을 잃어버려서 부주의했다. (I was careless because I lost my bag yesterday.)
§ Mistake 3: Not understanding the context of "unfaithful"
While "unfaithful" is a valid translation for "불성실하다," it's important to understand the context. It doesn't primarily refer to romantic infidelity, although it *can* be used in that sense in certain contexts (though other words like "바람피우다" are more common for romantic infidelity). More often, it refers to being unfaithful to one's duties, promises, or an organization.
- DEFINITION
- In the context of "불성실하다," "unfaithful" means not adhering to commitments or obligations.
그 직원은 회사에 불성실했다. (That employee was unfaithful to the company.)
§ How to use "불성실하다" correctly
To use "불성실하다" effectively, remember these key points:
- It describes a consistent lack of diligence or sincerity in one's actions or duties.
- It implies a failure to meet expectations or responsibilities due to a lack of earnestness.
- It can mean "unfaithful" in the sense of not upholding commitments or being disloyal to a cause or organization.
- It's a strong word, so use it when describing someone who truly exhibits these traits consistently.
그는 직업에 대한 태도가 불성실하다. (His attitude towards his job is undiligent/insincere.)
그녀는 학업에 불성실해서 성적이 좋지 않다. (She is undiligent in her studies, so her grades are not good.)
By keeping these distinctions in mind, you'll be able to use "불성실하다" more accurately and naturally, helping you sound more like a native Korean speaker. Keep practicing, and don't be afraid to make mistakes – that's how we learn!
Fun Fact
Many Korean words are Sino-Korean, meaning they are derived from Chinese characters. This often makes them sound more formal or academic than pure Korean words.
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Grammar to Know
This adjective can be used with the noun '사람' (person) to describe someone who is not diligent or sincere. For example, '불성실한 사람' (a not diligent person).
그는 정말 불성실한 사람이에요. (He is a truly undiligent person.)
When used in a descriptive clause modifying a noun, '불성실하다' changes to '불성실한'.
불성실한 태도는 좋지 않아요. (An insincere attitude is not good.)
To express 'to be not diligent or sincere' in a past tense, you can use '불성실했어요'.
학생 때 그는 불성실했어요. (He was undiligent when he was a student.)
You can use this adjective with the '-(으)면' grammar pattern to express a conditional meaning, such as 'if someone is not diligent'.
만약 불성실하면 좋은 결과를 얻기 어려워요. (If you are insincere, it's difficult to get good results.)
When describing an action performed in an insincere or undiligent way, you can use the adverbial form '불성실하게'.
그는 일을 불성실하게 했어요. (He did the work insincerely.)
Examples by Level
그 학생은 숙제를 불성실하게 했어요.
The student did homework insincerely (or not diligently).
약속을 불성실하게 지키면 안 돼요.
You shouldn't keep promises unfaithfully (or not sincerely).
그 사람은 일처리가 좀 불성실한 것 같아요.
That person seems a bit undiligent in handling work.
불성실한 태도는 좋지 않아요.
An insincere attitude is not good.
그녀는 매사에 불성실하지 않아요.
She is not insincere in everything.
불성실한 행동은 결과를 나쁘게 만들 수 있어요.
Undiligent actions can make results bad.
그는 약속에 불성실해서 믿을 수 없어요.
He is unfaithful to his promises, so he cannot be trusted.
팀원들이 불성실하면 프로젝트가 어려워져요.
If team members are not diligent, the project becomes difficult.
불성실한 태도로 일하면 결국 좋지 않은 결과를 가져올 거예요.
If you work with an insincere attitude, it will eventually bring bad results.
그는 약속을 자주 어기는 불성실한 사람으로 알려져 있어요.
He is known as an unfaithful person who often breaks promises.
보고서를 불성실하게 작성해서 교수님께 지적을 받았습니다.
I wrote the report insincerely, so I was pointed out by the professor.
불성실한 자세로는 어떤 일도 제대로 해낼 수 없어요.
With an insincere attitude, you can't do anything properly.
팀원 중 한 명이 불성실해서 프로젝트 진행에 어려움이 많았습니다.
One of the team members was unfaithful, so there were many difficulties in proceeding with the project.
그녀는 항상 불성실한 변명만 늘어놓아서 신뢰가 가지 않아요.
She always makes insincere excuses, so I don't trust her.
학생들이 불성실하게 수업에 참여하면 학습 효과가 떨어집니다.
If students participate in class insincerely, their learning effectiveness decreases.
불성실한 행동은 주변 사람들에게도 부정적인 영향을 미칠 수 있습니다.
Unfaithful actions can also have a negative impact on people around you.
그는 자신의 직무에 대해 불성실한 태도를 보였다.
He showed an unfaithful attitude towards his duties.
불성실한 사람은 신뢰하기 어렵다.
An insincere person is hard to trust.
그녀는 약속을 자주 어기는 불성실한 성격을 가지고 있다.
She has an unfaithful personality, often breaking promises.
학생이 과제를 불성실하게 제출해서 선생님께 꾸중을 들었다.
The student submitted the assignment insincerely and was scolded by the teacher.
회사가 고객에게 불성실한 정보를 제공하여 비난을 받았다.
The company was criticized for providing unfaithful information to customers.
그의 불성실한 행동 때문에 팀 전체가 피해를 입었다.
The whole team suffered damage because of his insincere behavior.
결혼 생활에서 불성실한 태도는 관계를 파괴할 수 있다.
An unfaithful attitude in marriage can destroy the relationship.
그는 처음에는 열심히 하는 듯 보였지만, 결국 불성실하게 프로젝트를 마무리했다.
He seemed to work hard at first, but in the end, he insincerely finished the project.
그는 업무에 불성실하여 결국 해고당했습니다.
He was unfaithful in his work, so he was eventually fired.
A causal connection is indicated by -아/어서 (so, because).
불성실한 태도로는 어떤 일도 제대로 이룰 수 없어요.
With an insincere attitude, you can't achieve anything properly.
-으로는/로 (with, by means of) indicates the manner or means. -을/를 수 없다 (cannot) indicates impossibility.
그 학생은 숙제를 자주 제출하지 않아 불성실하다는 평가를 받았다.
That student often didn't submit homework, so they received an evaluation of being insincere.
-아/어/여서 (so, because) indicates cause. -다는 평가를 받다 (to receive an evaluation of being...)
팀 프로젝트에서 불성실한 팀원 때문에 모두가 힘들어했어요.
Everyone had a hard time because of the insincere team member in the team project.
-때문에 (because of) indicates the reason. -아/어/여하다 (to feel, to seem) expresses the speaker's observation of someone else's feeling.
약속에 불성실한 사람은 신뢰하기 어렵습니다.
It's difficult to trust a person who is unfaithful to their promises.
-는 사람 (a person who...). -기 어렵다 (it is difficult to...)
그녀는 항상 맡은 일에 불성실해서 주변의 비난을 받곤 했다.
She was always insincere in the tasks she was given, so she often received criticism from those around her.
맡은 일 (the work given/entrusted). -곤 했다 (used to do, often did) indicates a past habit.
불성실한 보고서 때문에 상사에게 크게 질책당했습니다.
I was severely reprimanded by my boss because of the insincere report.
-때문에 (because of) indicates the reason. -에게 질책당하다 (to be reprimanded by someone).
그들의 불성실한 태도가 결국 회사를 망하게 하는 원인이 되었다.
Their insincere attitude eventually became the cause of the company's ruin.
-게 하다 (to make something happen). -는 원인이 되다 (to become the cause of...)
Common Collocations
Common Phrases
그는 일에 불성실하다.
He is insincere in his work.
그녀는 항상 불성실한 태도를 보인다.
She always shows an insincere attitude.
불성실하게 행동하지 마세요.
Don't act insincerely.
불성실한 직원은 해고될 수 있습니다.
An insincere employee can be fired.
그의 불성실함 때문에 문제가 생겼다.
Problems arose because of his insincerity.
수업에 불성실한 학생은 성적이 좋지 않다.
Students who are insincere in class do not get good grades.
불성실한 보고서는 받아들여지지 않을 것이다.
An insincere report will not be accepted.
그는 약속에 불성실한 사람이다.
He is a person who is unfaithful to promises.
불성실한 근무 태도는 용납되지 않습니다.
An insincere work attitude is not tolerated.
고객에게 불성실하게 대하면 안 된다.
You should not treat customers insincerely.
Often Confused With
While a lazy person might also be insincere in their work, '게으르다' focuses purely on the lack of willingness to work, whereas '불성실하다' is about the quality of effort or commitment.
An insincere person might be irresponsible, but '무책임하다' specifically refers to failing to fulfill duties or obligations, which is a consequence, not the core characteristic, of being '불성실하다'.
This phrase is very close in meaning and often used interchangeably in casual contexts when describing a lack of sincere effort. '불성실하다' is generally a more formal and comprehensive term.
Grammar Patterns
Idioms & Expressions
"책임감이 없다"
To lack a sense of responsibility
그는 책임감이 없어서 일을 제대로 끝내지 못해요. (He lacks responsibility, so he can't finish work properly.)
neutral"게으름을 피우다"
To be lazy, to shirk one's duties
시험 기간인데도 게으름을 피워서 공부를 안 해요. (Even though it's exam period, he's being lazy and not studying.)
neutral"대충하다"
To do something carelessly or half-heartedly
숙제를 대충해서 점수가 안 좋았어요. (I did my homework carelessly, so my grade wasn't good.)
neutral"성실하지 못하다"
To be insincere or not diligent (similar to the main word)
그 학생은 성실하지 못해서 항상 지각해요. (That student isn't diligent, so they're always late.)
neutral"맡은 일을 소홀히 하다"
To neglect one's assigned work
그는 맡은 일을 소홀히 해서 팀에 피해를 줬어요. (He neglected his assigned work and caused harm to the team.)
formal"마음이 뜨다"
To lose interest, to become unenthusiastic
그는 이 일에 마음이 떠서 집중을 못 해요. (He's lost interest in this work, so he can't concentrate.)
neutral"언행이 불일치하다"
To have a discrepancy between one's words and actions
그의 언행이 불일치해서 믿을 수가 없어요. (His words and actions don't match, so I can't trust him.)
formal"뺀질거리다"
To be shifty, to try to avoid work (colloquial)
그는 항상 뺀질거려서 미움을 받아요. (He's always trying to shirk work, so he's disliked.)
informal"한 눈 팔다"
To be distracted, to pay attention to something else
수업 시간에 한 눈 팔다가 선생님께 혼났어요. (I was distracted during class and got scolded by the teacher.)
neutral"책임을 회피하다"
To avoid responsibility
그는 항상 책임을 회피하려고만 해요. (He always tries to avoid responsibility.)
formalEasily Confused
Both '불성실하다' and '게으르다' can describe a lack of effort, leading to confusion. However, '게으르다' focuses on being lazy.
'불성실하다' (not diligent/sincere) implies a lack of commitment or faithfulness, often in a task or relationship. '게으르다' (lazy) refers to an unwillingness to work or exert oneself.
그 학생은 숙제를 하지 않아서 불성실하다고 평가받았다. (The student was evaluated as insincere because they didn't do their homework.) 반면, 게으른 사람은 침대에서 하루 종일 빈둥거렸다. (On the other hand, a lazy person idled in bed all day.)
Both words describe negative work ethics. '불성실하다' can sometimes lead to '무책임하다', making them seem similar.
'불성실하다' (not diligent/sincere) is about the quality of effort or commitment. '무책임하다' (irresponsible) is about failing to fulfill duties or obligations.
불성실한 태도로 일을 하면 결과가 좋지 않다. (If you work with an insincere attitude, the results won't be good.) 무책임한 행동은 다른 사람에게 피해를 줄 수 있다. (Irresponsible actions can harm others.)
This phrase directly translates to 'lacking sincerity,' which is a key part of '불성실하다'.
'불성실하다' (not diligent/sincere) is a formal adjective. '성의 없다' is a more casual expression meaning 'lacking sincerity' or 'half-hearted'. They are very close in meaning, with '불성실하다' often being a more encompassing term for a lack of commitment, while '성의 없다' specifically highlights the absence of sincere effort.
그는 약속에 불성실했다. (He was unfaithful to his promise.) 그의 발표는 성의 없어서 실망스러웠다. (His presentation lacked sincerity, so it was disappointing.)
This word directly means 'unfaithful,' which is one of the definitions of '불성실하다'.
'불성실하다' (not diligent/sincere, unfaithful) has a broader meaning covering both diligence and faithfulness. '불충실하다' (unfaithful) specifically refers to a lack of loyalty or adherence, particularly in relationships or duties. They overlap significantly when talking about faithfulness.
그 직원은 업무에 불성실해서 해고되었다. (That employee was fired for being insincere in their work.) 그녀는 친구에게 불충실하게 행동했다. (She acted unfaithfully towards her friend.)
Both terms describe a negative character trait. An insincere person might also be dishonest.
'불성실하다' (not diligent/sincere) focuses on a lack of effort, commitment, or faithfulness. '정직하지 않다' (not honest) refers to being untruthful or deceitful.
불성실한 태도는 팀의 사기를 떨어뜨린다. (An insincere attitude lowers team morale.) 정직하지 않은 사람은 신뢰하기 어렵다. (It's difficult to trust a dishonest person.)
Sentence Patterns
불성실하다
그는 불성실하다. (He is not diligent.)
[명사]이/가 불성실하다
직원들이 불성실해요. (The employees are not diligent.)
불성실한 [명사]
불성실한 태도. (An insincere attitude.)
[명사]가 불성실하다
그 학생이 불성실해요. (That student is not diligent.)
[동사]는 것이 불성실하다
공부하는 것이 불성실해요. (The act of studying is not diligent.)
불성실하게 [동사]
그는 불성실하게 일해요. (He works unfaithfully/without diligence.)
[명사]에 불성실하다
일에 불성실해요. (He is unfaithful to his work.)
불성실함
그의 불성실함 때문에 문제가 생겼어요. (Problems arose because of his unfaithfulness.)
Word Family
Nouns
Adjectives
Tips
Understanding 불성실하다
불성실하다 (bul-seong-sil-ha-da) is an adjective that describes someone or something as not diligent, insincere, or even unfaithful. It's often used to criticize a lack of effort or honesty.
Breaking Down the Word
The word comes from 불 (bul) meaning 'not' or 'un-', 성실 (seong-sil) meaning 'diligence' or 'sincerity', and 하다 (ha-da) meaning 'to do' or forming an adjective. So, literally, it means 'to be not diligent/sincere'.
Context of Use
You'll often hear this word in professional settings or when discussing responsibilities. For example, a student might be 불성실하다 if they don't study, or an employee if they don't do their work properly. It conveys a negative judgment.
Opposite Meaning
The opposite of 불성실하다 is 성실하다 (seong-sil-ha-da), which means to be diligent, sincere, or faithful. Learning antonyms together helps solidify vocabulary.
Example: Student Performance
그 학생은 숙제를 불성실하게 해요. (Geu haksaengeun sukjereul bulseongsilhage haeyo.) - That student does their homework insincerely/negligently. (Hint: 숙제 means homework)
Example: Work Ethic
불성실한 태도로 일하면 안 돼요. (Bulseongsilhan taedoro ilhamyeon an dwaeyo.) - You shouldn't work with an insincere/negligent attitude. (Hint: 태도 means attitude, 일하다 means to work)
Example: Relationship
그는 약속에 불성실했어요. (Geuneun yaksoge bulseongsilhaesseoyo.) - He was unfaithful/not diligent to his promise. (Hint: 약속 means promise)
Using in Conversation
Be careful when using 불성실하다 as it can be quite a strong criticism. It implies a moral judgment about someone's character or actions.
Korean Value of 성실
In Korean culture, 성실 (seong-sil, diligence/sincerity) is a highly valued trait. Therefore, being described as 불성실하다 can be a significant negative evaluation.
Related Nouns
You can also form the noun 불성실 (bulseongsil), which means insincerity, negligence, or lack of diligence. For example, 그의 불성실 때문에 문제가 생겼어요. (Geu-ui bulseongsil ttaemune munje-ga saenggyeosseoyo.) - Problems arose because of his negligence.
Memorize It
Mnemonic
Think of '불' (bul) as 'bull' (like a lazy bull) and '성실하다' (seong-sil-ha-da) as 'sincere holiday.' So, a 'lazy bull on a sincere holiday' is definitely 'not diligent or sincere.'
Visual Association
Imagine a student who is always late and never turns in homework on time. Picture them with a very relaxed, almost uninterested expression, symbolizing their lack of diligence and sincerity in their studies.
Word Web
Challenge
Describe a time someone you know (or a fictional character) acted '불성실하다' and what the consequences were. Try to use the word in at least two sentences.
Word Origin
Sino-Korean
Original meaning: 불 (not) + 성실 (sincere/diligent)
KoreanCultural Context
In Korean culture, diligence (성실) is a highly valued trait, especially in academic and professional settings. Therefore, being described as 불성실하다 can carry a strong negative connotation, implying a lack of effort or commitment. It's often used in situations where someone is not fulfilling their responsibilities or promises.
Frequently Asked Questions
10 questionsTo remember '불성실하다', break it down. '불-' is a negative prefix (like 'un-' or 'dis-'). '성실하다' means diligent or sincere. So, '불성실하다' literally means 'not diligent/sincere'. Think of someone who doesn't put in effort.
'불성실하다' is primarily used to describe people or their actions/attitudes. For example, a student can be 불성실한 학생 (an insincere student), or a report can be 불성실한 보고서 (an unfaithful report, meaning it's not thorough or accurate).
Some similar words include 게으르다 (lazy), 성의 없다 (lack sincerity/effort), or 태만하다 (negligent). While similar, each has a slightly different nuance. '불성실하다' specifically points to a lack of diligence or sincerity.
You can use it like any other adjective. For example:
그 학생은 불성실해요. (That student is insincere/undiligent.)
불성실한 태도 때문에 실망했어요. (I was disappointed because of the insincere attitude.)
Yes, '불성실하다' always carries a negative connotation. It describes a characteristic or action that is viewed unfavorably, implying a lack of commitment, effort, or honesty.
While a cheater is certainly '불성실하다' (insincere in their work), '불성실하다' itself doesn't specifically mean 'to cheat'. It describes the underlying attitude that might lead to cheating. For cheating, you'd use words like 부정행위를 하다 (to commit a dishonest act).
They are very similar! '불성실하다' is a single word formed with a negative prefix, while '성실하지 않다' uses the negative auxiliary verb '않다'. Both convey 'not diligent/sincere'. '불성실하다' might feel slightly stronger or more formal in some contexts, but they are often interchangeable.
Yes, it's quite common. You'll hear it used to describe students, employees, or anyone who isn't putting in proper effort or showing sincerity in their actions.
Since '불성실하다' is an adjective, it conjugates like other '하다' adjectives.
Present polite: 불성실해요
Present informal: 불성실해
Past polite: 불성실했어요
Future polite: 불성실할 거예요
Adjective form: 불성실한 (e.g., 불성실한 사람 - an insincere person)
It's less common for inanimate objects in the same way you'd describe a person. However, you could say something like 불성실한 답변 (an insincere/incomplete answer) or 불성실한 보고서 (an unfaithful/inadequate report), implying a lack of thoroughness or honesty in its creation.
Test Yourself 102 questions
학생은 숙제를 ___ 합니다.
The sentence means 'The student does homework not diligently.' '불성실하게' fits the meaning of 'not diligently'.
그는 약속에 ___ 행동했습니다.
The sentence means 'He acted unfaithfully to the promise.' '불성실하게' means 'unfaithfully'.
___ 사람은 신뢰하기 어렵습니다.
The sentence means 'An unfaithful person is hard to trust.' '불성실한' means 'unfaithful'.
그녀는 항상 ___ 일합니다.
The sentence means 'She always works not diligently.' '불성실하게' means 'not diligently'.
수업에 ___ 태도로 임하면 안 됩니다.
The sentence means 'You should not approach class with an insincere attitude.' '불성실한' means 'insincere'.
그는 시험 준비를 ___ 했습니다.
The sentence means 'He prepared for the exam not diligently.' '불성실하게' means 'not diligently'.
Greetings
Thank you
Yes, that's right.
Read this aloud:
안녕하세요
Focus: 안녕 (annyeong)
You said:
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Read this aloud:
괜찮아요?
Focus: 괜찮 (gwaenchan)
You said:
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Read this aloud:
다음에 봐요.
Focus: 다음에 (da-eume)
You said:
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This means 'I am not a student.' in Korean. The typical sentence structure is Subject-Object-Verb.
This means 'This is a book.' The pattern '이것은 ~입니다' is used to say 'This is ~'.
This means 'I eat rice.' The pattern '저는 ~을/를 먹어요' is used to say 'I eat ~'.
Choose the sentence where '불성실하다' is used correctly.
'불성실하다' describes a person's attitude or effort, not weather, fruit, or books.
Which of these words has the opposite meaning of '불성실하다'?
'불성실하다' means not diligent or sincere, so its opposite is '성실하다' which means diligent or sincere.
If someone is '불성실하다' in their work, what might happen?
If someone is insincere or not diligent, they are more likely to make mistakes in their work.
A student who often skips classes and doesn't do homework is '불성실하다'.
Skipping classes and not doing homework are examples of being insincere or not diligent, which is what '불성실하다' means.
If a person works very hard and always finishes tasks on time, they are '불성실하다'.
Working hard and finishing tasks on time indicates diligence and sincerity, which is the opposite of '불성실하다'.
'불성실하다' can be used to describe an animal that doesn't follow commands.
'불성실하다' is typically used to describe human behavior or attitude, not an animal's obedience.
Your friend always starts projects but rarely finishes them. Describe your friend's work ethic using '불성실하다'.
Well written! Good try! Check the sample answer below.
Sample answer
제 친구는 일을 시작하지만 자주 끝내지 않아요. 정말 불성실해요.
You have a part-time job, but you often arrive late and leave early. Your manager is not happy. How would you describe your own behavior using '불성실하다'?
Well written! Good try! Check the sample answer below.
Sample answer
저는 자주 지각하고 일찍 퇴근해요. 제 행동은 정말 불성실하다고 생각해요.
A student didn't do their homework and didn't study for the exam. Describe the student's attitude towards studying using '불성실하다'.
Well written! Good try! Check the sample answer below.
Sample answer
그 학생은 숙제도 안 하고 공부도 안 했어요. 정말 불성실한 학생이에요.
다음 중 누가 '불성실하다'고 할 수 있을까요?
Read this passage:
민수는 항상 열심히 일했어요. 그는 약속도 잘 지키고, 주어진 일은 항상 완벽하게 했습니다. 반면에, 그의 동생은 자주 지각하고 맡은 일을 제대로 하지 않았습니다.
다음 중 누가 '불성실하다'고 할 수 있을까요?
민수의 동생은 자주 지각하고 맡은 일을 제대로 하지 않았으므로 '불성실하다'고 할 수 있습니다.
민수의 동생은 자주 지각하고 맡은 일을 제대로 하지 않았으므로 '불성실하다'고 할 수 있습니다.
두 사람 중 어떤 사람이 '불성실하다'고 할 수 있습니까?
Read this passage:
어떤 사람은 매일 일찍 출근하고, 퇴근 시간까지 쉬지 않고 일합니다. 그들은 항상 책임감을 가지고 자신의 일을 합니다. 하지만 다른 사람은 자주 회사에 늦고, 일하는 동안에도 핸드폰만 봅니다. 그들은 일을 끝내지 못하는 경우가 많습니다.
두 사람 중 어떤 사람이 '불성실하다'고 할 수 있습니까?
자주 회사에 늦고 핸드폰만 보는 사람은 맡은 일에 충실하지 않으므로 '불성실하다'고 할 수 있습니다.
자주 회사에 늦고 핸드폰만 보는 사람은 맡은 일에 충실하지 않으므로 '불성실하다'고 할 수 있습니다.
이 글에서 '불성실하다'는 단어가 가장 잘 어울리는 사람은 누구입니까?
Read this passage:
수잔은 숙제를 항상 제시간에 제출하고 시험 공부도 열심히 합니다. 그러나 그녀의 친구인 제임스는 숙제를 거의 하지 않고, 시험 전날에도 게임만 합니다. 제임스는 성적이 좋지 않습니다.
이 글에서 '불성실하다'는 단어가 가장 잘 어울리는 사람은 누구입니까?
제임스는 숙제를 거의 하지 않고 시험 공부도 안 하므로 '불성실하다'고 할 수 있습니다.
제임스는 숙제를 거의 하지 않고 시험 공부도 안 하므로 '불성실하다'고 할 수 있습니다.
This sentence means 'He is often insincere.' The word order for a basic Korean sentence is Subject-Adverb-Adjective/Verb.
This means 'The work was too unfaithful (not diligent).' The structure follows Subject-Adverb-Adjective.
This means 'The student did the homework insincerely.' '불성실하게' is an adverb modifying the verb '했어요'.
Write a short paragraph about a time someone you know was unreliable or didn't follow through on a promise. Use '불성실하다' at least once in your paragraph.
Well written! Good try! Check the sample answer below.
Sample answer
제 친구 중 한 명은 약속을 자주 어겨서 좀 불성실하다고 생각했어요. 항상 다음에는 잘하겠다고 했지만, 결국 또 같은 실수를 반복했어요. 저는 그 친구에게 많이 실망했지만, 그래도 계속 믿어주려고 노력했어요. 이제는 그 친구의 말을 다 믿지는 않아요.
Describe a hypothetical situation where someone's '불성실하다' attitude could lead to negative consequences in a work environment.
Well written! Good try! Check the sample answer below.
Sample answer
만약 한 직원이 맡은 업무를 불성실하게 처리한다면, 회사 전체에 큰 문제가 생길 수 있습니다. 예를 들어, 중요한 보고서를 제시간에 제출하지 않거나, 실수를 자주 하게 되면 다른 직원들에게도 피해를 줄 수 있습니다. 결국 이런 태도는 팀의 신뢰를 깨고, 프로젝트 실패로 이어질 수도 있습니다.
Imagine you are giving advice to a friend about how to be a more reliable person. What would you tell them to avoid being '불성실하다'?
Well written! Good try! Check the sample answer below.
Sample answer
친구에게 불성실하지 않으려면 약속을 할 때 신중해야 한다고 말할 거예요. 그리고 일단 약속을 했으면 무슨 일이 있어도 지키려고 노력해야 한다고요. 만약 불가피하게 약속을 지키기 어렵다면 미리 솔직하게 말하고 양해를 구하는 것이 중요하다고 조언할 것 같아요. 책임감을 가지고 행동하면 주변 사람들이 너를 더 믿게 될 거야.
김 씨가 맡은 프로젝트에서 제외된 가장 큰 이유는 무엇입니까?
Read this passage:
김 씨는 항상 맡은 일을 불성실하게 처리해서 동료들의 불만이 많았다. 그는 마감 기한을 자주 넘겼고, 회의에도 늦는 경우가 많았다. 결국 김 씨는 중요한 프로젝트에서 제외되었다. 그의 태도 때문에 팀 전체가 어려움을 겪었다.
김 씨가 맡은 프로젝트에서 제외된 가장 큰 이유는 무엇입니까?
김 씨는 맡은 일을 불성실하게 처리했기 때문에 동료들의 불만이 많았고, 그 결과 중요한 프로젝트에서 제외되었습니다.
김 씨는 맡은 일을 불성실하게 처리했기 때문에 동료들의 불만이 많았고, 그 결과 중요한 프로젝트에서 제외되었습니다.
새로운 직원의 문제점은 무엇이었습니까?
Read this passage:
새로운 직원은 처음에는 열정적으로 보였지만, 시간이 지날수록 불성실한 모습을 보이기 시작했다. 지시받은 업무를 제대로 이해하지 못하거나, 대충 처리하는 경우가 많았다. 결국 상사는 그 직원에게 주의를 주었고, 개선되지 않으면 해고될 수도 있다고 경고했다.
새로운 직원의 문제점은 무엇이었습니까?
새로운 직원은 불성실한 태도로 업무를 처리하는 경우가 많았고, 이로 인해 상사로부터 경고를 받았습니다.
새로운 직원은 불성실한 태도로 업무를 처리하는 경우가 많았고, 이로 인해 상사로부터 경고를 받았습니다.
조원들이 프로젝트를 완성하는 데 어려움을 겪은 이유는 무엇입니까?
Read this passage:
이번 학기 팀 프로젝트는 정말 힘들었다. 조원 중 한 명이 너무 불성실해서 모든 책임을 다른 조원들이 떠맡아야 했다. 그는 회의에 나타나지 않거나, 맡은 부분의 자료를 전혀 준비하지 않았다. 결국 우리는 그 조원 없이 프로젝트를 완성해야 했다.
조원들이 프로젝트를 완성하는 데 어려움을 겪은 이유는 무엇입니까?
조원 중 한 명이 불성실하게 행동하여 다른 조원들이 모든 책임을 떠맡았고, 결국 그 조원 없이 프로젝트를 완성해야 했습니다.
조원 중 한 명이 불성실하게 행동하여 다른 조원들이 모든 책임을 떠맡았고, 결국 그 조원 없이 프로젝트를 완성해야 했습니다.
'그는' (He) is the subject, '자주' (often) is an adverb, '일을' (work/tasks) is the object, '불성실하게 합니다' (does it undiligently/insincerely) is the verb phrase describing the action. The typical Korean sentence structure is Subject-Adverb-Object-Verb.
'불성실한 태도는' (An insincere attitude) is the subject, '문제를' (problems) is the object, '만들 수 있어요' (can create/make) is the verb phrase. This follows the Subject-Object-Verb pattern, with the adjective modifying the noun.
'그녀의' (Her) is a possessive pronoun, '불성실한 행동이' (undiligent behavior) is the subject, and '실망스러웠습니다' (was disappointing) is the predicate. The order follows natural Korean sentence flow.
그는 자신의 일에 늘 성실하게 임했지만, 최근에는 좀 ___ 것 같다.
문맥상 '성실하게 임했지만'의 반대되는 의미로, 최근 태도가 변했다는 뉘앙스를 주기 위해 '불성실한 것 같다'가 자연스럽습니다.
약속 시간에 자주 늦는 것은 ___ 태도라고 생각해요.
약속 시간에 늦는 행동은 성실하지 못한 태도를 나타내므로 '불성실한'이 적절합니다.
시험 공부를 ___ 해서 좋은 결과를 기대하기 어렵다.
좋은 결과를 기대하기 어렵다는 결과로 미루어 볼 때, 공부를 성실하게 하지 않았다는 의미의 '불성실하게'가 맞습니다.
그는 늘 맡은 바를 ___ 수행하지 않아 신뢰를 잃었다.
신뢰를 잃었다는 결과로 미루어 볼 때, 맡은 일을 성실하게 하지 않았다는 의미의 '불성실하게'가 적절합니다.
___ 직원은 회사에 해를 끼칠 수 있다.
회사에 해를 끼칠 수 있는 직원은 책임감 없고 성실하지 못한 직원이므로 '불성실한'이 알맞습니다.
보고서를 ___ 작성해서 다시 제출하라고 지시받았다.
보고서를 다시 제출하라는 지시를 받았다는 것은 보고서가 성실하게 작성되지 않았다는 의미이므로 '불성실하게'가 적합합니다.
The teacher was disappointed with the insincere/undiligent students.
She has a tendency to not keep promises faithfully/diligently.
If you work unfaithfully/undiligently, it's difficult to expect good results.
Read this aloud:
그 직원은 자신의 업무에 불성실해서 해고되었습니다.
Focus: 불성실해서
You said:
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Read this aloud:
저는 불성실한 태도를 싫어합니다.
Focus: 싫어합니다
You said:
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Read this aloud:
불성실한 행동은 관계를 망칠 수 있습니다.
Focus: 망칠 수 있습니다
You said:
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This sentence means 'He often acts insincerely.' The adjectival form '불성실하게' modifies the verb '행동한다'.
This sentence means 'The insincere employee was eventually fired.' '불성실한' modifies '직원은'.
This sentence means 'Her insincerity caused problems.' '불성실함' is the noun form, meaning 'insincerity'.
그는 업무에 매우 ___ 자주 마감 기한을 넘깁니다.
The sentence implies a negative consequence (missing deadlines) due to a characteristic related to diligence. '불성실해서' (because he is not diligent) fits the context perfectly, suggesting his lack of diligence leads to missed deadlines.
약속 시간에 늦는 것은 상대방에게 ___ 태도로 비춰질 수 있습니다.
Arriving late for an appointment is generally seen as a sign of disrespect or lack of commitment, which aligns with '불성실한' (undiligent/insincere).
계속해서 지시를 어기는 그의 행동은 그가 얼마나 ___ 사람인지 보여줍니다.
Consistently disregarding instructions indicates a lack of diligence or commitment, making '불성실한' (undiligent/insincere) the most appropriate descriptor for such a person.
프로젝트를 성공적으로 마무리하려면 모든 팀원이 ___ 없이 최선을 다해야 합니다.
For a successful project, team members need to be diligent. The phrase '___ 없이' (without ___) implies that a negative trait should be absent. Therefore, '불성실함' (lack of diligence) is the correct choice, meaning 'without a lack of diligence'.
그는 약속을 자주 어겨서 사람들이 그를 ___ 사람으로 생각합니다.
Someone who frequently breaks promises is considered unreliable and insincere. '불성실한' (unfaithful/insincere) accurately describes how people would perceive such an individual.
그 직원은 반복적인 지적에도 불구하고 계속해서 업무에 ___ 태도를 보였습니다.
Despite repeated feedback, the employee continued to show a certain attitude towards work. The context of '반복적인 지적에도 불구하고' (despite repeated feedback) implies a negative attitude, making '불성실한' (undiligent/insincere) the correct fit.
그는 약속에 자주 늦는 편이라서 그의 태도가 __________고 생각했어요.
약속에 자주 늦는 행동은 불성실함을 나타냅니다.
이번 프로젝트를 망친 주된 이유는 팀원들의 __________ 태도 때문이었습니다.
프로젝트를 망친 원인으로는 '불성실한' 태도가 적절합니다.
그녀는 항상 자신의 일에 최선을 다하지 않고, 마감 기한도 자주 어겨서 __________ 평가를 받았습니다.
최선을 다하지 않고 마감 기한을 어기는 것은 불성실한 태도입니다.
맡은 일을 제대로 하지 않고 책임을 회피하는 것은 불성실한 행동이다.
맡은 일을 제대로 하지 않고 책임을 회피하는 것은 불성실함의 전형적인 예시입니다.
학업에 불성실한 학생은 대체로 좋은 성적을 받는다.
학업에 불성실한 학생은 일반적으로 좋은 성적을 받기 어렵습니다.
친구와의 약속을 지키지 않는 것은 불성실하다고 할 수 없다.
친구와의 약속을 지키지 않는 것은 불성실한 행동입니다.
The speaker is talking about someone's consistently unfaithful attitude at work.
The sentence discusses the consequence of insincere actions.
The sentence talks about the impact of an unfaithful employee on a company's progress.
Read this aloud:
불성실한 태도는 관계에 악영향을 미칠 수 있습니다.
Focus: 불성실한 (bul-seong-sil-han), 악영향 (ak-yeong-hyang)
You said:
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Read this aloud:
성공하려면 불성실함을 버려야 합니다.
Focus: 성공하려면 (seong-gong-ha-ryeo-myeon), 버려야 (beo-ryeo-ya)
You said:
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Read this aloud:
그의 불성실함 때문에 프로젝트가 지연되었어요.
Focus: 불성실함 (bul-seong-sil-ham), 지연되었어요 (ji-yeon-doe-eoss-eo-yo)
You said:
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Discuss a time when someone's 불성실함 (lack of diligence/sincerity) caused a problem. What happened, and what were the consequences?
Well written! Good try! Check the sample answer below.
Sample answer
대학교 팀 프로젝트에서 한 팀원이 불성실하게 참여하여 마감 기한을 맞추지 못했습니다. 결국, 팀 전체의 성적이 나빠졌고, 그 팀원은 다른 팀원들에게 신뢰를 잃게 되었습니다. 이러한 불성실함은 개인뿐만 아니라 팀 전체에 부정적인 영향을 미쳤습니다.
Explain how 불성실하다 can manifest in a professional setting. Provide at least two examples.
Well written! Good try! Check the sample answer below.
Sample answer
직장에서 불성실하다는 것은 여러 방식으로 나타날 수 있습니다. 예를 들어, 맡은 업무를 책임감 없이 대충 처리하거나, 마감 기한을 자주 어기는 행동이 이에 해당합니다. 또한, 회의에 지각하거나 개인적인 일로 업무 시간을 자주 사용하는 것도 불성실함의 한 형태입니다.
Imagine you are giving advice to a friend who is being 불성실하다 about their studies. What would you say to motivate them to be more diligent?
Well written! Good try! Check the sample answer below.
Sample answer
네가 요즘 공부에 불성실한 것 같아서 걱정돼. 지금은 힘들고 귀찮겠지만, 조금만 더 참고 꾸준히 하면 분명 좋은 결과를 얻을 수 있을 거야. 작은 목표부터 시작해서 성취감을 느끼면 동기 부여도 되고, 더 열심히 할 수 있을 거야. 같이 힘내자!
위 글의 내용으로 미루어 볼 때, 필자가 강조하는 것은 무엇입니까?
Read this passage:
불성실한 태도는 개인의 성장뿐만 아니라 조직의 성공에도 부정적인 영향을 미칠 수 있습니다. 특히 팀워크가 중요한 현대 사회에서는 한 사람의 불성실함이 전체 프로젝트의 실패로 이어질 수 있습니다. 따라서 우리는 항상 성실한 자세를 유지하며 주어진 역할에 최선을 다해야 합니다.
위 글의 내용으로 미루어 볼 때, 필자가 강조하는 것은 무엇입니까?
이 글은 불성실한 태도가 개인과 조직에 미치는 부정적인 영향을 설명하고, 따라서 성실해야 한다고 주장합니다. 따라서 '불성실한 태도가 미치는 부정적인 영향'이 글의 주요 강조점입니다.
이 글은 불성실한 태도가 개인과 조직에 미치는 부정적인 영향을 설명하고, 따라서 성실해야 한다고 주장합니다. 따라서 '불성실한 태도가 미치는 부정적인 영향'이 글의 주요 강조점입니다.
이 글의 내용과 일치하지 않는 것은 무엇입니까?
Read this passage:
최근 한 연구에 따르면, 직장에서 불성실한 직원들은 동료들의 사기 저하와 생산성 감소에 직접적인 영향을 미치는 것으로 나타났습니다. 이는 결국 기업 전체의 실적 부진으로 이어질 수 있어, 기업들은 이러한 문제를 해결하기 위한 방안을 적극적으로 모색해야 합니다.
이 글의 내용과 일치하지 않는 것은 무엇입니까?
이 글은 불성실한 직원이 기업 실적에 '부정적인' 영향을 미친다고 명시하고 있으므로, '긍정적인 영향을 준다'는 내용은 일치하지 않습니다.
이 글은 불성실한 직원이 기업 실적에 '부정적인' 영향을 미친다고 명시하고 있으므로, '긍정적인 영향을 준다'는 내용은 일치하지 않습니다.
학업에 불성실한 학생들을 위한 해결책으로 언급되지 않은 것은 무엇입니까?
Read this passage:
학업에 불성실한 학생들은 대개 학습 동기가 부족하거나, 목표 설정이 명확하지 않은 경우가 많습니다. 이러한 학생들에게는 개별화된 학습 계획과 긍정적인 피드백을 제공하여 학습에 대한 흥미를 유발하고 성취감을 느끼게 해주는 것이 중요합니다.
학업에 불성실한 학생들을 위한 해결책으로 언급되지 않은 것은 무엇입니까?
이 글에서는 긍정적인 피드백을 제공해야 한다고 했지, 부정적인 피드백을 언급하지 않았습니다. 오히려 부정적인 피드백은 해결책이 될 수 없습니다.
이 글에서는 긍정적인 피드백을 제공해야 한다고 했지, 부정적인 피드백을 언급하지 않았습니다. 오히려 부정적인 피드백은 해결책이 될 수 없습니다.
This sentence means 'His insincere attitude eventually caused problems.' The words are ordered to form a grammatically correct and meaningful sentence in Korean.
This sentence means 'Due to the team members' insincerity, the project was delayed.' The order follows Korean sentence structure.
This sentence means 'He is known for being unfaithful to his promises.' The words are arranged to create a natural-sounding Korean sentence.
This sentence describes how his approach to work was always insincere, leading to many problems.
This proverb suggests that someone who is insincere with themselves will easily become insincere with others.
This sentence highlights that not meeting the project deadline was clearly an insincere attitude.
/ 102 correct
Perfect score!
Understanding 불성실하다
불성실하다 (bul-seong-sil-ha-da) is an adjective that describes someone or something as not diligent, insincere, or even unfaithful. It's often used to criticize a lack of effort or honesty.
Breaking Down the Word
The word comes from 불 (bul) meaning 'not' or 'un-', 성실 (seong-sil) meaning 'diligence' or 'sincerity', and 하다 (ha-da) meaning 'to do' or forming an adjective. So, literally, it means 'to be not diligent/sincere'.
Context of Use
You'll often hear this word in professional settings or when discussing responsibilities. For example, a student might be 불성실하다 if they don't study, or an employee if they don't do their work properly. It conveys a negative judgment.
Opposite Meaning
The opposite of 불성실하다 is 성실하다 (seong-sil-ha-da), which means to be diligent, sincere, or faithful. Learning antonyms together helps solidify vocabulary.
Related Content
This Word in Other Languages
More business words
에 대한
A2Concerning or relating to; about, regarding.
~대하여
A2About, concerning, regarding.
대해서
A2Concerning or with regard to; about, regarding.
에 대해
A2About; regarding.
풍요롭다
A2To be abundant, prosperous, or rich.
관철하다
B2To carry through, achieve, or persist in one's will or goal until it is accomplished, despite difficulties.
~에 따라
B1According to, depending on; as stated by or determined by.
에 따라
A2According to; in accordance with.
에 의하면
B1According to; as stated by or reported by.
계좌번호
A2A unique identifier for a bank account.
