15秒でわかる
- Expresses absolute certainty.
- Use when you are 100% sure.
- Versatile across different situations.
- Avoid if you have any doubts.
意味
このフレーズは、ポルトガル語で絶対的な確信や信念を表現するための定番です。「100％確信している」や「疑いの余地はない」と言うようなものです。それは自信の強い雰囲気を持ち、曖昧さの余地を残しません。
主な例文
3 / 12Texting a friend about a movie
Vi o trailer, `não tenho dúvida` que esse filme vai ser um sucesso!
I saw the trailer, I have no doubt this movie will be a hit!
At a job interview (Zoom call)
Com minha experiência em gestão de projetos, `não tenho dúvida` que posso agregar valor à sua equipe.
With my experience in project management, I have no doubt that I can add value to your team.
Instagram caption for a travel photo
Essa viagem para a Patagônia foi surreal. `Não tenho dúvida` que foi a melhor aventura da minha vida!
This trip to Patagonia was surreal. I have no doubt it was the best adventure of my life!
文化的背景
The phrase `Não tenho dúvida` likely emerged as a direct and emphatic way to express conviction in a culture that values strong opinions and clear communication. It reflects a desire to cut through ambiguity and state one's position firmly. Its existence highlights the importance of confidence and certainty in social and professional interactions within Portuguese-speaking communities.
Sound Like a Native
Use 'Não tenho dúvida' with a confident tone, maybe followed by 'que...' to introduce the subject you're certain about. It adds weight to your words!
Cultural Nuance: Directness
In many Portuguese-speaking cultures, expressing certainty directly is valued. 'Não tenho dúvida' fits perfectly when you want to show you've made up your mind or have strong faith in something.
15秒でわかる
- Expresses absolute certainty.
- Use when you are 100% sure.
- Versatile across different situations.
- Avoid if you have any doubts.
What It Means
This phrase, Não tenho dúvida, is a powerful way to express complete certainty in Portuguese. It literally means "I don't have doubt." Think of it as your verbal mic drop when you're absolutely sure about something. It’s more than just agreeing; it’s about having zero reservations or uncertainties. The vibe is confident and unwavering, like you've already considered all angles and arrived at a solid conclusion. It’s the linguistic equivalent of a firm nod and a confident smile. You're not just guessing; you *know*. It's a statement of firm belief, whether it's about a fact, a person's ability, or a future outcome. It’s like your internal GPS is screaming, "This is it!"
How To Use It
You can use Não tenho dúvida in tons of situations. Need to assure a friend you'll be there? Não tenho dúvida que vou. (I have no doubt I'll go.) Wondering if your favorite team will win? Não tenho dúvida, eles vão ganhar! (I have no doubt, they'll win!) It works great when someone asks for your opinion and you have a strong one. It’s also perfect for confirming something you're certain about, like a plan or a piece of information. Imagine you're confirming a meeting time: "Are you sure it's at 3 PM?" "Sim, não tenho dúvida." (Yes, I have no doubt.) It’s versatile, fitting into many everyday conversations seamlessly. It’s like your Swiss Army knife of certainty!
Formality & Register
This phrase is quite flexible! It leans towards neutral but can easily slide into informal or even slightly formal contexts depending on how you say it and what follows. When texting a friend, it's super casual. Não tenho dúvida que o filme vai ser bom! (I have no doubt the movie will be good!) In a work meeting, if you're asked about a project's success, saying "Não tenho dúvida que concluiremos a tempo" (I have no doubt we'll finish on time) sounds professional and confident. Just be mindful of your tone. A super enthusiastic NÃO TENHO DÚVIDA! might be too much for a formal setting, but a calm, measured delivery works wonders. It’s like a chameleon – it adapts! It’s not slang, but it’s not stiff either. A good middle ground!
Real-Life Examples
- Social Media: Someone posts a pic of their amazing vacation. You comment:
Que viagem incrível! Não tenho dúvida que foi inesquecível.(What an incredible trip! I have no doubt it was unforgettable.) - Work: Your boss asks if you can meet a deadline. You reply:
Com a equipe atual, não tenho dúvida que entregaremos o projeto.(With the current team, I have no doubt we will deliver the project.) - Friends: Planning a surprise party. You tell the organizer:
Não tenho dúvida que ele(a) vai amar a surpresa!(I have no doubt that he/she will love the surprise!) - Online Shopping: Reading reviews for a product. If most are positive, you might think, "
Não tenho dúvidaque vou comprar isso." (I have no doubt I'm going to buy this.) - News: Discussing a political event. "
Não tenho dúvidaque isso vai gerar muita discussão." (I have no doubt this will generate a lot of discussion.)
When To Use It
Use Não tenho dúvida when you want to convey strong conviction. This applies when you're absolutely certain about a fact, a prediction, or someone's capabilities. If your friend asks if you think they'll get the job, and you *know* they will, this phrase is perfect. It’s also great for emphasizing agreement. If someone states an opinion you wholeheartedly share, you can reinforce it with Não tenho dúvida. It shows you're not just passively agreeing, but actively endorsing the idea. Think of it as adding a stamp of approval to your thoughts. It’s your best friend when you want to sound decisive and knowledgeable. Don't be shy; use it when you mean it!
When NOT To Use It
Avoid Não tenho dúvida when you're actually unsure or just guessing. Saying it when you have even a sliver of doubt can make you look unreliable or even dishonest if the outcome proves you wrong. It’s also overkill for trivial matters where certainty isn't expected or necessary. For example, don't say "Não tenho dúvida que vai chover" (I have no doubt it will rain) if you're just glancing at a cloudy sky without checking the forecast. That's a recipe for an embarrassing "Oops!" moment. Also, in very formal, sensitive situations where expressing absolute certainty might seem arrogant or dismissive of other possibilities, a more nuanced phrase might be better. It’s like wearing a tuxedo to a beach party – usually not the right fit!
Common Mistakes
Learners sometimes get a bit tangled with prepositions or verbs. A common slip-up is trying to translate too literally or using a different verb. Remember, ter (to have) is the key verb here, not ser (to be) or estar (to be). Another mistake is adding unnecessary words, making it sound unnatural. Stick to the core phrase for maximum impact.
Eu sou sem dúvida.
✓Não tenho dúvida.
Eu tenho certeza sem dúvida.
✓Não tenho dúvida.
Eu não duvido.
✓Não tenho dúvida. (While grammatically okay, Não tenho dúvida is the idiomatic and more common expression for this level of certainty).
Common Variations
While Não tenho dúvida is standard, you might hear slight variations or related phrases that convey similar certainty:
Com certeza!: This is super common and means "Certainly!" or "For sure!" It's often used as a quick, emphatic agreement. It's a bit more direct thanNão tenho dúvidabut serves a similar purpose.Sem dúvida: This literally means "Without doubt." It can be used similarly toCom certezaor as an adverbial phrase. "Ele é, sem dúvida, o melhor candidato." (He is, without a doubt, the best candidate.)Tenho a certeza: This means "I have the certainty" and is a very close synonym toNão tenho dúvida. It's slightly more formal-sounding but widely used.Pode ter certeza: Means "You can be sure." It's often used to reassure someone else. "Pode ter certeza que tudo vai ficar bem." (You can be sure everything will be okay.)
Real Conversations
Scenario 1: Planning a trip
* Ana: Você acha que o voo às 8h ainda tem assentos? (Do you think the 8 AM flight still has seats?)
* Bruno: Com certeza! Acabei de checar. Não tenho dúvida que conseguiremos. (For sure! I just checked. I have no doubt we'll get them.)
Scenario 2: Discussing a friend's skills
* Carla: Será que o Pedro consegue terminar o projeto sozinho? Ele parece sobrecarregado. (Do you think Pedro can finish the project alone? He seems overloaded.)
* Davi: Não tenho dúvida. Ele é o mais competente da equipe. Vai dar um jeito. (I have no doubt. He's the most competent on the team. He'll figure it out.)
Quick FAQ
- Is
Não tenho dúvidaformal or informal? It's quite versatile, leaning neutral. It works in most contexts, from casual chats to professional settings, depending on delivery. - What's the quickest way to say "I'm sure"?
Com certeza!is very common and snappy. - Can I use it for predictions? Absolutely! If you're confident about a future event, like "
Não tenho dúvidaque vai chover amanhã" (I have no doubt it will rain tomorrow), it fits perfectly. - What if I'm not *that* sure? Then avoid it! Use phrases like
Acho que sim(I think so) orTalvez(Maybe) instead. Don't oversell your certainty!
使い方のコツ
This phrase is quite flexible and generally sits at a neutral level of formality, easily adaptable to informal chats or professional settings. The key is your tone and context. Avoid using it if you have any lingering uncertainty, as it implies complete conviction. Ensure you use the correct verb 'ter' (to have), not 'ser' (to be), for the most natural expression.
Sound Like a Native
Use 'Não tenho dúvida' with a confident tone, maybe followed by 'que...' to introduce the subject you're certain about. It adds weight to your words!
Cultural Nuance: Directness
In many Portuguese-speaking cultures, expressing certainty directly is valued. 'Não tenho dúvida' fits perfectly when you want to show you've made up your mind or have strong faith in something.
The Certainty Trap!
Be careful! Using 'Não tenho dúvida' when you're actually unsure can backfire. If you're wrong, people might see you as unreliable. Only use it when you truly mean it!
Combine for Impact
Pair 'Não tenho dúvida' with a gesture like a firm nod or a confident look. Non-verbal cues amplify the message of certainty, just like in real life!
例文
12Vi o trailer, `não tenho dúvida` que esse filme vai ser um sucesso!
I saw the trailer, I have no doubt this movie will be a hit!
Expressing strong confidence about a future event based on available information.
Com minha experiência em gestão de projetos, `não tenho dúvida` que posso agregar valor à sua equipe.
With my experience in project management, I have no doubt that I can add value to your team.
Showing confidence in one's abilities during a professional assessment.
Essa viagem para a Patagônia foi surreal. `Não tenho dúvida` que foi a melhor aventura da minha vida!
This trip to Patagonia was surreal. I have no doubt it was the best adventure of my life!
Used emphatically to describe a highly positive personal experience.
Obrigado pela entrega rápida! `Não tenho dúvida` que vou pedir aqui de novo.
Thanks for the fast delivery! I have no doubt I'll order from here again.
Expressing satisfaction and certainty about future patronage.
Você acha que o chefe vai aprovar a nossa proposta?
Do you think the boss will approve our proposal?
Responding with certainty about a colleague's capabilities.
Essa coreografia é incrível! `Não tenho dúvida` que vai viralizar!
This choreography is amazing! I have no doubt it's going to go viral!
Expressing strong belief in the potential success of a trending piece of content.
Recebi sua confirmação. `Não tenho dúvida` que estaremos prontos para a reunião de amanhã.
I received your confirmation. I have no doubt we will be ready for tomorrow's meeting.
Confirming readiness and commitment in a business context.
✗ `Eu sou sem dúvida que ele virá.` → ✓ `Não tenho dúvida que ele virá.`
✗ I am without doubt that he will come. → ✓ I have no doubt that he will come.
The verb 'ter' (to have) is used, not 'ser' (to be).
✗ `Eu não duvido nada.` → ✓ `Não tenho dúvida nenhuma.` or simply `Não tenho dúvida.`
✗ I don't doubt anything. → ✓ I have no doubt whatsoever. or simply I have no doubt.
While understandable, 'Não tenho dúvida' is the more common and idiomatic way to express this certainty.
Se tem uma coisa que eu `não tenho dúvida` é que vou comer esse bolo inteiro sozinho!
If there's one thing I have no doubt about, it's that I'll eat this entire cake by myself!
Used humorously to emphasize a strong (and perhaps slightly greedy) intention.
Eu sei que você está preocupado com a prova, mas `não tenho dúvida` que você vai se sair bem.
I know you're worried about the test, but I have no doubt you will do well.
Offering strong encouragement and expressing unwavering belief in someone's success.
Depois de ouvir os dois lados, `não tenho dúvida` que a razão está com ele.
After hearing both sides, I have no doubt that he is right.
Stating a firm conclusion after considering different viewpoints.
自分をテスト
Fill in the blank with the correct phrase.
The sentence expresses certainty about the project's success, making 'não tenho dúvida' the most appropriate choice.
Choose the sentence that uses the phrase correctly.
Which sentence correctly expresses strong certainty?
This option correctly uses 'Não tenho dúvida' followed by 'que' to express certainty about the person coming. The other options are grammatically incorrect or express uncertainty.
Find and fix the error in the sentence.
The correct idiomatic expression uses the verb 'ter' (to have), not 'ser' (to be), to express certainty. The phrase is 'Não tenho dúvida'.
Fill in the blank, considering the context of strong conviction.
The context 'Apesar dos desafios' (Despite the challenges) implies a strong, unwavering belief in achieving the goal, making 'não tenho dúvida' the best fit.
Translate this sentence into Portuguese.
This translates the English expression of certainty directly into the common Portuguese phrase.
Choose the sentence that best conveys absolute certainty.
Which option expresses the strongest conviction?
'Não tenho dúvida nenhuma' intensifies the certainty, making it the strongest expression of conviction among the options.
Identify and correct the unnatural phrasing.
When expressing certainty about a fact, the conjunction 'de que' is typically used after 'Não tenho dúvida', not 'se' (which implies doubt or conditionality).
Complete the sentence with the phrase expressing certainty.
The phrase 'Com base nos dados' (Based on the data) suggests a logical conclusion, making 'não tenho dúvida' the most fitting expression of certainty.
Translate the following sentence into Portuguese.
This translation uses the impersonal form 'Não há dúvida' which is equivalent in meaning to the personal 'Não tenho dúvida' when stating a general fact.
Select the sentence that expresses strong confidence.
Which sentence shows the speaker is sure?
'Não tenho dúvida' is the direct expression of certainty, meaning 'I have no doubt'.
Find and fix the mistake.
The conjunction 'de que' is needed to connect 'Não tenho dúvida' with the clause expressing what the speaker is sure about.
Choose the best option to convey absolute conviction.
The preceding clause 'Ele treinou muito' (He trained a lot) provides a strong reason for certainty, making 'Não tenho dúvida' the most logical and emphatic conclusion.
🎉 スコア： /12
ビジュアル学習ツール
Formality Spectrum for 'Não tenho dúvida'
Chatting with close friends, texting.
Cara, não tenho dúvida que esse jogo vai ser épico!
Everyday conversations, general discussions.
Não tenho dúvida que o plano vai funcionar.
Professional emails, meetings, presentations.
Não tenho dúvida que atingiremos as metas estabelecidas.
Rarely used in highly academic or legal contexts; alternatives preferred.
Não tenho dúvida que a evidência apresentada é conclusiva.
Where You'll Hear 'Não tenho dúvida'
Confirming plans with friends
Não tenho dúvida que estarei lá às 8!
Giving professional opinions
Não tenho dúvida que este projeto será um sucesso.
Predicting outcomes
Não tenho dúvida que o time vai ganhar.
Assessing someone's skills
Não tenho dúvida da sua capacidade.
Commenting on social media
Não tenho dúvida que seu post vai bombar!
Reassuring someone
Pode ficar tranquilo, não tenho dúvida que vai dar tudo certo.
Certainty Expressions in Portuguese
Contexts for Using 'Não tenho dúvida'
Personal Beliefs
- • Expressing confidence in a friend's abilities
- • Stating your opinion strongly
- • Confirming your own intentions
Predictions
- • Forecasting results (sports, projects)
- • Guessing future trends
- • Anticipating consequences
Professional Settings
- • Assuring clients of delivery
- • Confirming project completion
- • Highlighting team competence
Everyday Scenarios
- • Confirming meeting times
- • Recommending a product/service
- • Agreeing emphatically
練習問題バンク
12 問題Sobre o sucesso do projeto, ______ que tudo dará certo.
The sentence expresses certainty about the project's success, making 'não tenho dúvida' the most appropriate choice.
Which sentence correctly expresses strong certainty?
This option correctly uses 'Não tenho dúvida' followed by 'que' to express certainty about the person coming. The other options are grammatically incorrect or express uncertainty.
間違いを見つけて直してください:
Eu sou sem dúvida que o resultado será positivo.
The correct idiomatic expression uses the verb 'ter' (to have), not 'ser' (to be), to express certainty. The phrase is 'Não tenho dúvida'.
Apesar dos desafios, ______ que alcançaremos nossa meta.
The context 'Apesar dos desafios' (Despite the challenges) implies a strong, unwavering belief in achieving the goal, making 'não tenho dúvida' the best fit.
I have no doubt you will succeed.
ヒント： Use 'ter' for doubt., 'You will succeed' translates to 'você vai ter sucesso'.
This translates the English expression of certainty directly into the common Portuguese phrase.
Which option expresses the strongest conviction?
'Não tenho dúvida nenhuma' intensifies the certainty, making it the strongest expression of conviction among the options.
間違いを見つけて直してください:
Não tenho dúvida se ele é o culpado.
When expressing certainty about a fact, the conjunction 'de que' is typically used after 'Não tenho dúvida', not 'se' (which implies doubt or conditionality).
Com base nos dados, ______ que a estratégia funcionará.
The phrase 'Com base nos dados' (Based on the data) suggests a logical conclusion, making 'não tenho dúvida' the most fitting expression of certainty.
There is no doubt that Brazil is beautiful.
ヒント： Consider the impersonal form 'Há' (There is)., 'No doubt' can be 'Não há dúvida'.
This translation uses the impersonal form 'Não há dúvida' which is equivalent in meaning to the personal 'Não tenho dúvida' when stating a general fact.
Which sentence shows the speaker is sure?
'Não tenho dúvida' is the direct expression of certainty, meaning 'I have no doubt'.
間違いを見つけて直してください:
Não tenho dúvida ele vai conseguir.
The conjunction 'de que' is needed to connect 'Não tenho dúvida' with the clause expressing what the speaker is sure about.
Ele treinou muito. ______ que ele vai ganhar a corrida.
The preceding clause 'Ele treinou muito' (He trained a lot) provides a strong reason for certainty, making 'Não tenho dúvida' the most logical and emphatic conclusion.
🎉 スコア： /12
ビデオチュートリアル
このフレーズに関するYouTubeの動画チュートリアルを探す。
よくある質問
20 問Literally, it translates to 'I don't have doubt'. This structure uses the verb 'ter' (to have) in Portuguese, meaning you possess no doubt whatsoever. It's a direct way to express a lack of uncertainty about something.
Use this phrase when you are absolutely certain about something. This could be a fact, a prediction, someone's ability, or your own intention. It's perfect for showing strong conviction and confidence in your statement.
Yes, it's quite versatile! While it can be used casually, it's also perfectly acceptable in professional settings. Delivering it calmly and confidently makes it suitable for work emails, meetings, or presentations where you need to express certainty.
'Não tenho dúvida' expresses a deeper personal conviction, meaning 'I have no doubt'. 'Com certeza' is more of a direct affirmation, like 'For sure!' or 'Certainly!', often used as a quick agreement or confirmation. Both show certainty, but 'Não tenho dúvida' feels more profound.
Definitely avoid it if you're not completely sure. Saying 'Não tenho dúvida' when you have reservations can make you seem untrustworthy if you turn out to be wrong. It's also best avoided in highly sensitive discussions where absolute certainty might sound dismissive.
Both phrases mean essentially the same thing: 'I am sure' or 'I have no doubt'. 'Tenho a certeza' (I have the certainty) might sound slightly more formal or emphatic to some speakers, but they are largely interchangeable in conveying strong conviction.
'Sem dúvida' literally means 'Without doubt'. It functions more like an adverbial phrase, often used to emphasize a statement, similar to 'undoubtedly' or 'certainly'. For example, 'Ele é, sem dúvida, o melhor.' (He is, without a doubt, the best.)
Yes, learners sometimes incorrectly use the verb 'ser' (to be) instead of 'ter' (to have), resulting in 'Eu sou sem dúvida'. The correct idiomatic expression requires 'ter', making it 'Não tenho dúvida'.
Absolutely! If you feel strongly confident about a future event, this phrase is ideal. For instance, 'Não tenho dúvida que vai chover amanhã' (I have no doubt it will rain tomorrow) works perfectly if you're very sure.
The core meaning and usage of 'Não tenho dúvida' are consistent across Portuguese-speaking countries. Regional variations might exist in the frequency of its use compared to alternatives like 'Com certeza' or 'Sem dúvida', but the fundamental expression of certainty remains the same.
Expressing strong conviction can be valued in many Portuguese-speaking cultures as a sign of confidence and decisiveness. Using phrases like 'Não tenho dúvida' effectively shows you have a firm opinion or belief, which can be seen positively in many social and professional contexts.
Besides 'Não tenho dúvida', you could use 'Tenho certeza absoluta' (I have absolute certainty) or the very common and slightly less personal 'Com certeza!' (For sure!). 'Pode ter certeza' (You can be sure) is used to reassure someone else.
If you want to express doubt, you'd use phrases like 'Eu duvido' (I doubt), 'Tenho dúvidas' (I have doubts), 'Não tenho certeza' (I'm not sure), or simply 'Talvez' (Maybe). These clearly signal uncertainty.
Yes, like many phrases, context and tone can make 'Não tenho dúvida' sarcastic. If someone says something obviously untrue, responding with an overly enthusiastic 'Ah, não tenho dúvida!' with a smirk could imply the opposite.
Yes, adding 'nenhuma' (none) strengthens the phrase: 'Não tenho dúvida nenhuma'. This emphasizes your certainty even further, meaning 'I have absolutely no doubt whatsoever'. It's a common and effective way to stress your conviction.
'Não tenho dúvida' is the standard, idiomatic way to express certainty. 'Eu não duvido' (I don't doubt) is grammatically correct but less common for expressing firm conviction; it might imply a lack of skepticism in a more literal sense rather than absolute certainty.
You typically use the conjunction 'que' (that) to connect the phrase to the clause stating your certainty. For example: 'Não tenho dúvida *que* ele virá.' (I have no doubt *that* he will come.) Sometimes, especially after pauses, 'de que' is used: 'Não tenho dúvida *de que* ele virá.'
Yes, you can use it to express certainty about past events, often implying you have strong evidence or reasoning. For example: 'Não tenho dúvida que ele já saiu.' (I have no doubt he already left.) This implies you believe it's a fact based on available information.
A common pitfall for learners is mispronouncing the 'nh' sound in 'dúvida' and 'tenho'. It's a nasal sound, similar to the 'ny' in 'canyon'. Practice saying 'tenho' and 'dúvida' slowly to get the nasal quality right.
Yes, the concept exists universally. In English, it's 'I have no doubt' or 'I'm sure'. In Spanish, 'No tengo duda'. In French, 'Je n'ai aucun doute'. The structure and meaning are very similar across Romance languages.
関連フレーズ
Com certeza!
synonymFor sure! / Certainly!
Both phrases express certainty, but 'Com certeza!' is often a quicker, more emphatic affirmation than the more personal 'Não tenho dúvida'.
Sem dúvida
synonymWithout a doubt
'Sem dúvida' functions as an adverbial phrase emphasizing certainty, while 'Não tenho dúvida' is a personal statement of conviction.
Tenho a certeza
synonymI am sure / I have the certainty
This phrase is a very close synonym, almost interchangeable with 'Não tenho dúvida', perhaps carrying a slightly more formal tone.
Pode ter certeza
related topicYou can be sure
This phrase is related because it also conveys certainty, but it's directed at reassuring someone else rather than stating personal conviction.
Eu duvido
antonymI doubt
This is the direct opposite, expressing skepticism or lack of certainty, contrasting sharply with the firm conviction of 'Não tenho dúvida'.
Talvez
antonymMaybe / Perhaps
While not a direct antonym, 'Talvez' signifies uncertainty, making it the opposite choice when 'Não tenho dúvida' expresses absolute certainty.
Não estou certo(a)
antonymI'm not sure
This phrase directly expresses the absence of certainty, serving as a clear contrast to the unwavering confidence conveyed by 'Não tenho dúvida'.
