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B1 adverb 6 min de lecture

効率よく

kouritsu yoku

Entraîne-toi Exemples Notes et astuces 効率よく en 30 secondes

Explication 効率よく in your Level:

At the A1 level, you might not use 'kouritsu yoku' yet. Instead, you use simple words like 'hayaku' (fast) or 'jouzu ni' (well). However, you can understand it as 'doing something in a good way to save time.' Think of it as 'Good (yoku) + Efficiency (kouritsu).' If you want to say 'I want to study well,' you might say 'Jouzu ni benkyou shitai,' but 'Kouritsu yoku benkyou shitai' is the next step up to sound more like a native speaker who cares about their time.

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At the A2 level, you start to talk about your daily routines and work. 'Kouritsu yoku' is useful for explaining how you manage your day. You can use it with basic verbs like 'tsukau' (use) for time or money. Example: 'Jikan o kouritsu yoku tsukaimasu' (I use time efficiently). It helps you move beyond just saying you are busy; it shows you are trying to be smart with your tasks. You will see this word in simple advice columns or 'how-to' guides for students.

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At the B1 level (the target level for this word), you should be able to use 'kouritsu yoku' to discuss productivity, work-life balance, and learning strategies. You understand that it's not just about speed, but about the ratio of effort to results. You can use it in sentences like 'To improve my Japanese, I need to study efficiently.' You also begin to recognize it in business contexts, such as when a boss asks the team to work more efficiently to avoid overtime. It is a key word for passing the JLPT N3 level.

At the B2 level, you use 'kouritsu yoku' to describe complex systems and societal issues. You might talk about energy efficiency in the context of climate change or the efficiency of the public transport system. You can contrast it with 'koukateki' (effective) to show you understand the nuance between doing the right things and doing things right. You are also comfortable using the noun form 'kouritsu' and the 'na-adjective' form 'kouritsuteki' in formal essays or presentations.

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At the C1 level, 'kouritsu yoku' is a standard part of your professional vocabulary. You use it to critique business models, discuss economic theories, or analyze the performance of algorithms in technology. You might use it in the passive voice or within complex grammatical structures like 'kouritsu yoku susumeru koto ga motomerarete iru' (it is required to proceed efficiently). You understand the social implications of a society that over-prioritizes efficiency over well-being.

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At the C2 level, you have a masterly command of the term and its synonyms. You can discuss the philosophical debate between 'efficiency' and 'redundancy' in biological or social systems. You might use the term in high-level academic writing or when interpreting for corporate executives. You can play with the word in literature or high-level rhetoric, perhaps using it ironically to describe someone who is so 'efficient' they have lost their humanity. You understand every subtle nuance and regional variation in how efficiency is discussed in the Japanese-speaking world.

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Entraîne-toi Exemples Notes et astuces

効率よく en 30 secondes

Kouritsu yoku means 'efficiently' in Japanese, focusing on maximizing output while minimizing waste of time or energy.
It is a B1-level adverb frequently used in professional, academic, and daily life contexts.
The word combines 'kouritsu' (efficiency) and 'yoku' (the adverbial form of 'good').
It is commonly paired with verbs like 'work', 'study', 'use', and 'advance'.

The phrase 効率よく (kouritsu yoku) is a cornerstone of the Japanese professional and educational lexicon. At its heart, it combines the noun kouritsu (efficiency/efficacy rate) with the adverbial form of the adjective yoi (good). In English, we translate this most accurately as 'efficiently' or 'in a streamlined manner.' It describes the act of achieving maximum productivity with minimum wasted effort or expense. Unlike simply doing something 'fast' (hayaku), kouritsu yoku implies a strategic approach where resources—be they time, money, or energy—are optimized to achieve the best possible result.

Core Concept: The optimization of input versus output. It is the 'smart' way of working.
Common Usage: Frequently used in business settings (kaizen culture), academic advice, and daily life hacks.

仕事を効率よく進めるためには、優先順位をつけることが大切です。

Translation: To advance work efficiently, it is important to set priorities.

In Japanese society, there is a deep-seated respect for the concept of muda (waste). Therefore, being able to perform tasks 効率よく is seen as a highly desirable skill. It isn't just about being a 'workaholic'; it's about being a 'work-smart-aholic.' For example, a student who studies for three hours and retains everything has studied more kouritsu yoku than one who studies for ten hours but remembers nothing. This adverb is often paired with verbs like manabu (learn), hataraku (work), tsukau (use/spend), and susumeru (advance/proceed).

Grammar Note: Since it ends in 'ku', it functions as an adverb. It modifies the verb that follows it immediately or later in the sentence.

限られた時間を効率よく使いましょう。

Translation: Let's use our limited time efficiently.

Culturally, this word is tied to the post-war economic miracle of Japan, where 'efficiency' was the mantra of industrial manufacturing. Today, it has permeated the digital age, appearing in the names of productivity apps and time-management seminars. It suggests a level of mastery and control over one's environment and schedule.

Using 効率よく requires understanding the verbs it naturally attaches to. Because it describes the 'manner' of an action, it usually precedes the verb. It is most common in instructional, advisory, or reflective contexts. You will see it in sentences discussing self-improvement, corporate strategy, or even household chores like cooking or cleaning.

Verb Pairing: Study: Used to describe learning methods that yield high scores with less cramming.

単語を効率よく覚えるコツは何ですか？

Translation: What are the tips for memorizing vocabulary efficiently?

Notice how the adverb modifies oboeru (memorize). It asks for a 'good' (yoku) 'efficiency' (kouritsu) way to memorize. Another common use case is with unpoko (movement) or logistics. If you are running errands, you want to plan your route kouritsu yoku so you don't double back on your tracks.

Verb Pairing: Energy/Fuel: Used in technical contexts regarding engines or heating systems.

このヒーターは部屋を効率よく暖めます。

Translation: This heater warms the room efficiently.

The structure is usually [Object] + [Particle] + 効率よく + [Verb]. For example, [Jikan] o [kouritsu yoku] [tsukau]. You can also use it to describe a state of being, though less common, by using the 'naru' (to become) verb: 'Kouritsu ga yoku naru' (Efficiency becomes good).

新しいシステムのおかげで、効率よく作業ができるようになりました。

Translation: Thanks to the new system, we are now able to work efficiently.

If you step into a Japanese office, 効率よく is likely one of the most frequent adverbs you'll hear during morning meetings (chourei). Managers use it to encourage staff to finish their work within the designated hours to avoid excessive overtime (zangyou). It is also a favorite word of YouTubers in the 'StudyTube' or 'Lifehack' niches.

Business Context: Used during project planning to discuss ROI and time management.

会議は短時間で効率よく終わらせましょう。

Translation: Let's finish the meeting efficiently in a short time.

In the education sector, teachers often tell students how to kouritsu yoku review for exams. You'll see it in textbooks, particularly those focusing on 'Smart Study' methods. It's also prevalent in advertisements for household appliances—washing machines that use less water, or refrigerators that keep food fresh using less electricity.

Daily Life: Used when planning travel itineraries or grocery shopping routes.

スマホを使って、効率よく情報を集めます。

Translation: I use my smartphone to gather information efficiently.

Finally, in sports coaching, trainers use it to describe movement. A runner who doesn't waste energy through unnecessary upper-body movement is running kouritsu yoku. It is a word that bridges the gap between mechanical performance and human behavior.

The most common mistake learners make is confusing 効率よく with hayaku (quickly). While efficiency often results in speed, they are not the same. If you do something quickly but make many mistakes, you are hayai but not kouritsu yoku.

Mistake: Confusing with 'Effective': Learners often use it when they mean '効果的' (koukateki - effective). 'Effective' means getting the result; 'Efficient' means getting the result with low waste.

❌ 薬を効率よく飲みました。
✅ 薬を効果的に飲みました。

Note: You don't take medicine 'efficiently' (wasting little medicine); you take it 'effectively' to get better.

Another mistake is the grammatical form. Since 'kouritsu' is a noun, you cannot say 'kouritsu ni' unless you turn it into the adjective 'kouritsuteki ni'. Using 'kouritsu yoku' is the most natural way to turn the concept of 'good efficiency' into an adverb. Some learners also try to use 'kouritsu ii' as an adverb, but in Japanese, the 'i' must change to 'ku' to modify a verb.

Mistake: Over-reliance in Social Settings: In social gatherings or dates, focusing on 'efficiency' can sound cold or robotic. Avoid saying 'Let's eat efficiently' (kouritsu yoku tabeyou) unless you're in a competitive eating contest!

While 効率よく is versatile, several other terms offer nuances for specific situations. Choosing the right one shows a higher level of Japanese proficiency.

能率的 (nouritsuteki): Very similar to 'kouritsu', but often used specifically for industrial or mechanical performance. It focuses on the 'rate of work'.
手際よく (tegiwa yoku): Used for manual tasks like cooking or repairing. It means 'skillfully and quickly' with your hands.
要領よく (youryou yoku): This has a slightly different nuance. It means 'getting the knack of something' or 'navigating a situation cleverly'. Sometimes it can imply being a bit lazy but smart enough to get the job done.

彼は要領よく立ち回って、昇進した。

Translation: He navigated things cleverly (smoothly) and got promoted.

When comparing kouritsu yoku and tegiwa yoku, think of the difference between a factory system (kouritsu) and a chef chopping vegetables (tegiwa). One is about the logic of the process, the other is about the dexterity of the person.

How Formal Is It?

Le savais-tu ?

The kanji 効 (kou) contains the radical for 'strength' (力), suggesting that an 'effect' is something achieved through applied power. The kanji 率 (ritsu) originally depicted a net or a rope used for measuring, hence 'rate'.

Guide de prononciation

UK koʊ.ɾi.tsɯ jo.kɯ

US koʊ.ɾi.tsu jo.ku

Japanese is pitch-accented. In 'kouritsu', the pitch usually starts low, rises on 'u', and drops on 'ri'. 'Yoku' starts low and rises.

Rime avec

Hyouritsu (standard rate) Zouritsu (creation rate) Goku (extremely) Tokyoku (authorities) Kyoku (song/office) Moku (eye/order) Roku (six) Boku (I - male)

Erreurs fréquentes

Pronouncing 'kouritsu' as 'koritsu' (missing the long 'o'), which means 'isolation'.
Pronouncing 'tsu' as 'su'.
Stressing the wrong syllable like English (Japanese has flat or pitch stress).
Making the 'u' sounds too long like 'yoo-kooo'.
Merging 'kouritsu' and 'yoku' without a slight break.

Niveau de difficulté

Lecture 3/5

The kanji 効率 are common but require N3 level knowledge. The adverbial form is straightforward.

Écriture 4/5

Writing 効率 (especially the 14-stroke 効 and 11-stroke 率) takes practice.

Expression orale 2/5

Pronunciation is simple once the 'tsu' and long 'o' are mastered.

Écoute 2/5

Very common in news and business, making it easy to spot once learned.

Quoi apprendre ensuite

Prérequis

良い (yoi) 速い (hayai) 時間 (jikan) 使う (tsukau) 仕事 (shigoto)

Apprends ensuite

効果的 (koukateki) 生産性 (seisansei) 最適化 (saitekika) 無駄 (muda) 優先順位 (yuusen jun'i)

Avancé

費用対効果 (hiyou tai kouka - cost-effectiveness) 歩留まり (budomari - yield rate) 稼働率 (kadouritsu - operating rate) 能率給 (nouritsukyuu - efficiency wage) 合理的配慮 (gouriteki hairyo - reasonable accommodation)

Grammaire à connaître

Adverbial form of I-adjectives (~ku)

良い (yoi) -> 良く (yoku)

Compound nouns (Kango)

効 (effect) + 率 (rate) = 効率

Tame ni (In order to)

効率よく勉強するために、スマホを置く。

Potential verbs with adverbs

効率よく仕事ができる。

Noun modification with adverbs

効率よく動く人 (A person who moves efficiently).

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Exemples par niveau

時間を効率よく使います。

I use time efficiently.

Simple Subject-Object-Adverb-Verb structure.

効率よく勉強したいです。

I want to study efficiently.

Using 'tai' (want to) with the adverb.

お金を効率よく使ってください。

Please use money efficiently.

Imperative form 'kudasai'.

効率よく動くことが大切です。

Moving efficiently is important.

Using 'koto' to turn a phrase into a noun.

この道具は効率よく切れます。

This tool cuts efficiently.

Potential/State verb 'kireru'.

効率よく掃除をしましょう。

Let's clean efficiently.

Volitional form 'shimashou'.

もっと効率よくできますか？

Can you do it more efficiently?

Question form with potential verb 'dekimasu'.

効率よく歩きましょう。

Let's walk efficiently.

Basic adverbial usage.

料理を効率よく作る方法を知りたい。

I want to know how to cook efficiently.

Noun modification 'tsukuru houhou'.

パソコンを使うと、効率よく仕事ができます。

If you use a computer, you can work efficiently.

Conditional 'to' structure.

効率よく単語を覚えるために、アプリを使います。

I use an app to memorize words efficiently.

Purpose 'tame ni'.

彼はいつも効率よく準備をします。

He always prepares efficiently.

Frequency adverb 'itsumo'.

効率よく買い物をすれば、時間が余ります。

If you shop efficiently, you'll have extra time.

Conditional 'ba' form.

エネルギーを効率よく使いましょう。

Let's use energy efficiently.

Direct object 'energy'.

この機械は効率よく水を温めます。

This machine warms water efficiently.

Transitive verb 'atatamemasu'.

効率よく情報を集めるのは難しいです。

Gathering information efficiently is difficult.

Topic marker 'no wa' with a verb phrase.

限られた予算を効率よく配分する必要があります。

It is necessary to allocate the limited budget efficiently.

Noun phrase 'hitsuyou ga arimasu'.

効率よくタスクをこなすために、スケジュールを立てます。

I make a schedule to get through tasks efficiently.

Verb 'konasu' meaning to manage or carry out.

どうすれば効率よく筋肉を鍛えられますか？

How can I train my muscles efficiently?

Interrogative 'dou sureba'.

仕事を効率よく進めるには、休憩も必要です。

To advance work efficiently, breaks are also necessary.

Condition 'ni wa' indicating requirements.

このエンジンは燃料を効率よく燃焼させます。

This engine burns fuel efficiently.

Causative form 'nenshou sasemasu'.

効率よく連絡を取り合うために、グループチャットを作りました。

We created a group chat to communicate efficiently.

Compound verb 'tori-au' (mutually communicate).

無駄な会議を減らして、効率よく働きたい。

I want to work efficiently by reducing useless meetings.

Te-form for means/method 'herashite'.

最短ルートを選んで、効率よく目的地へ向かいます。

I'll head to the destination efficiently by choosing the shortest route.

Directing toward a goal 'e mukaimasu'.

物流システムを改善し、商品を効率よく配送する。

Improve the logistics system and deliver goods efficiently.

Stem form 'kaizenshi' used as a conjunction in formal writing.

資源を効率よく循環させる社会を目指しています。

We are aiming for a society that circulates resources efficiently.

Verb 'junkann saseru' (to circulate).

太陽光エネルギーを効率よく電気に変換する技術。

Technology that converts solar energy into electricity efficiently.

A ni B o henkan suru (convert A into B).

効率よく収益を上げるための戦略を練る。

Develop a strategy to increase profits efficiently.

Verb 'neru' meaning to elaborate or work out a plan.

組織が効率よく機能するためには、透明性が欠かせない。

Transparency is essential for an organization to function efficiently.

Phrase 'kakasenai' (indispensable).

限られた人員で効率よくプロジェクトを運営する。

Operate a project efficiently with limited personnel.

De-particle indicating means/circumstance.

データを効率よく処理するアルゴリズムを開発した。

Developed an algorithm that processes data efficiently.

Relative clause modifying 'algorithm'.

効率よく学習を進める上で、フィードバックは重要だ。

In terms of proceeding with learning efficiently, feedback is important.

Ue de (in the process of / when doing).

マクロ経済の視点から、資本を効率よく投下する。

Invest capital efficiently from a macroeconomic perspective.

Formal verb 'touka suru' (to invest/drop).

都市機能を効率よく配置することで、渋滞を緩和する。

Alleviate congestion by arranging urban functions efficiently.

Koto de (by means of).

既存のインフラを効率よく活用し、コストを削減する。

Utilize existing infrastructure efficiently and cut costs.

Katsuyou suru (to utilize/make use of).

バイオテクノロジーを用いて、効率よく食料を生産する。

Produce food efficiently using biotechnology.

O mochiite (using/utilizing).

情報の非対称性を解消し、市場を効率よく運営する。

Resolve information asymmetry and operate the market efficiently.

Economic terminology 'jouhou no hitsaitaisei'.

効率よく知識を体系化することが、専門家には求められる。

Experts are required to systematize knowledge efficiently.

Passive form 'motomerareru'.

サプライチェーン全体を効率よく最適化する必要がある。

It is necessary to optimize the entire supply chain efficiently.

Saitekika suru (to optimize).

限られた時間枠の中で、効率よく議論を深める。

Deepen the discussion efficiently within a limited timeframe.

Naka de (within).

熱力学第二法則に抗い、エネルギーを効率よく抽出する試み。

An attempt to extract energy efficiently, defying the second law of thermodynamics.

Aragai (defying/resisting) - literary stem form.

官僚機構の冗長性を排し、行政サービスを効率よく提供する。

Eliminate redundancy in the bureaucracy and provide administrative services efficiently.

Jouchousei (redundancy) and Hai-suru (eliminate).

ニューラルネットワークの重みを効率よく調整する手法。

A method for efficiently adjusting the weights of a neural network.

Technical AI terminology.

効率よく富を再分配するための税制改革案。

A tax reform proposal to redistribute wealth efficiently.

Saidunpai (redistribution).

生命維持システムを効率よく稼働させ、深宇宙探査に挑む。

Operate life-support systems efficiently and challenge deep space exploration.

Kadou saseru (to operate/run).

効率よく合意を形成するための、洗練された交渉術。

Sophisticated negotiation techniques to form a consensus efficiently.

Goui o keisei suru (form a consensus).

生態系が効率よく栄養素を循環させるメカニズムを解明する。

Elucidate the mechanism by which ecosystems circulate nutrients efficiently.

Kaimei suru (to elucidate/solve).

効率よく、かつ持続可能な形で都市を開発するパラダイムシフト。

A paradigm shift to develop cities in an efficient and sustainable way.

Katsu (and also) - formal conjunction.

Collocations courantes

効率よく勉強する

効率よく働く

効率よく時間を使う

効率よく情報を集める

効率よくエネルギーを消費する

効率よくタスクをこなす

効率よく筋肉を鍛える

効率よく準備を進める

効率よく資金を運用する

効率よく栄養を摂取する

Phrases Courantes

効率よく回る

— To go around several places in an efficient order. Often used for sightseeing or errands.

観光地を効率よく回るプラン。

効率よく稼ぐ

— To earn money efficiently. Implies a high hourly rate or low effort for high pay.

副業で効率よく稼ぐ方法。

効率よく整理する

— To organize or categorize things efficiently to save space or time later.

書類を効率よく整理する。

効率よく吸収する

— To absorb something (knowledge, nutrients, moisture) efficiently.

学んだことを効率よく吸収する。

効率よく配置する

— To arrange or position items/people in an optimal way.

家具を効率よく配置した部屋。

効率よく冷やす

— To cool something down efficiently, often used for electronics or food.

パソコンのCPUを効率よく冷やす。

効率よく燃やす

— To burn something efficiently (fuel, calories).

有酸素運動で脂肪を効率よく燃やす。

効率よく伝える

— To convey information clearly and concisely without waste.

自分の考えを効率よく伝える。

効率よく回す

— To run or manage a system/cycle efficiently. Often used in business operations.

PDCAサイクルを効率よく回す。

効率よく貯める

— To save up (money, points) efficiently.

ポイントを効率よく貯める裏技。

Souvent confondu avec

効率よく vs 速く (hayaku)

Means 'fast'. Efficiency is about waste reduction, speed is just about time.

効率よく vs 効果的 (koukateki)

Means 'effective'. It refers to the result, whereas 'efficiency' refers to the process.

効率よく vs 上手 (jouzu)

Means 'skillful'. You can be skillful but inefficient if you use the wrong tools.

Expressions idiomatiques

"要領がいい"

— To be clever at handling things or getting the knack of something. Related to 'kouritsu yoku'.

彼は要領がいいので、仕事が早い。

Neutral

"一石二鳥"

— Killing two birds with one stone. The ultimate form of efficiency.

歩いて通勤するのは、運動にもなるし節約にもなって、一石二鳥だ。

Common

"二兎を追う者は一兎をも得ず"

— One who chases two rabbits catches neither. A warning against trying to be 'too efficient' by multitasking.

あれもこれもやろうとすると、二兎を追う者は一兎をも得ずになるよ。

Proverb

"急がば回れ"

— Slow and steady wins the race (literally: if you are in a hurry, go the long way around). Suggests that the most 'efficient' path isn't always the fastest-looking one.

近道は危ないから、急がば回れで行こう。

Proverb

"無駄足を踏む"

— To make a fruitless trip. The opposite of being efficient.

店が閉まっていて、無駄足を踏んでしまった。

Common

"手抜きをする"

— To cut corners. Sometimes mistaken for efficiency, but implies a drop in quality.

掃除で手抜きをしてはいけない。

Negative

"骨折り損のくたびれ儲け"

— Great effort for no gain. The definition of inefficiency.

一日中探したのに見つからず、骨折り損のくたびれ儲けだった。

Proverb

"安物買いの銭失い"

— Penny wise, pound foolish. Buying something cheap that breaks is not efficient.

すぐ壊れる靴を買うのは、安物買いの銭失いだ。

Proverb

"時は金なり"

— Time is money. The foundational philosophy behind 'kouritsu yoku'.

時は金なりだから、効率よく動こう。

Common

"朝飯前"

— A piece of cake (literally: before breakfast). Doing something so efficiently it's easy.

これくらいの修理なら、朝飯前だよ。

Informal

Facile à confondre

効率よく vs 孤立 (koritsu)

Sounds very similar to 'kouritsu' (efficiency).

Koritsu means 'isolation'. Kouritsu has a long 'o' sound (kou), while koritsu has a short 'o'.

社会から孤立する (isolated from society) vs 効率を上げる (raise efficiency).

効率よく vs 公立 (kouritsu)

Identical pronunciation in some pitch accents.

公立 means 'public' (as in a public school). The context usually makes it clear.

公立高校 (public high school) vs 効率的な勉強 (efficient study).

効率よく vs 恒立 (kouritsu)

Rare word, but sounds identical.

Refers to something standing permanently. Almost never used in daily life.

N/A

効率よく vs 能率 (nouritsu)

Synonym for efficiency.

Nouritsu is more about the 'rate' of work/output. Kouritsu is broader and includes resource management.

仕事の能率がいい。

効率よく vs 要領 (youryou)

Both describe doing things well.

Youryou is about 'knack' or 'cleverness'. Kouritsu is a more objective measure of performance.

要領よく世渡りする。

Structures de phrases

[Noun] を効率よく [Verb]。

時間を効率よく使う。

効率よく [Verb] ために、[Action]。

効率よく覚えるために、メモを取る。

効率よく [Verb] ことができる。

効率よく作業することができる。

いかに効率よく [Verb] かが重要だ。

いかに効率よく生産するかが重要だ。

効率よく [Verb] 仕組みを作る。

効率よく配送する仕組みを作る。

効率よく [Verb] ことが求められている。

効率よく運営することが求められている。

効率よく [Verb] 上での課題。

効率よく開発を進める上での課題。

効率よく、かつ [Adverbial phrase] ...

効率よく、かつ正確に処理する。

Famille de mots

Noms

効率 (Efficiency)

高効率 (High efficiency)

低効率 (Low efficiency)

効率化 (Streamlining/Optimization)

Verbes

効率化する (To streamline/optimize)

Adjectifs

効率的 (Efficient - na-adjective)

効率がいい (Efficient - i-adjective phrase)

Apparenté

能率 (Performance/Efficiency)

生産性 (Productivity)

最適化 (Optimization)

合理化 (Rationalization)

時短 (Time-saving)

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Comment l'utiliser

frequency

Very common in professional and educational settings.

Erreurs courantes

Using 'kouritsu ni' instead of 'kouritsu yoku' or 'kouritsuteki ni'. → kouritsu yoku / kouritsuteki ni
Kouritsu is a noun, so it needs 'yoku' (good) or the '-teki' suffix to become an adverb.
Confusing 'kouritsu' (efficiency) with 'koritsu' (isolation). → kouritsu (long 'o')
The long vowel is crucial. 'Koritsu' means being alone/isolated.
Using 'kouritsu yoku' to mean 'effective' (getting results). → koukateki ni
Efficiency is about the process/waste. Effectiveness is about the final result.
Saying 'kouritsu yoku' for creative hobbies like painting. → tanoshiku / yukkuri
In Japanese culture, creative or relaxing acts aren't usually described as needing 'efficiency' unless it's a commercial job.
Forgetting the 'ku' in 'yoku' when modifying a verb. → kouritsu yoku benkyou suru
Adverbs must end in 'ku' to modify verbs. 'Kouritsu yoi' is an adjective phrase.

Astuces

Pair with 'Muda'

When explaining *why* something is efficient, mention that there is no 'muda' (waste). This reinforces the concept in Japanese.

Softening the Tone

If you are suggesting someone else be efficient, use 'kouritsu yoku dekireba...' (If we could do it efficiently...) to avoid sounding bossy.

Kanji Precision

Don't confuse the 'ritsu' in efficiency with the 'ritsu' in 'standing' (立つ). The one in efficiency (率) has many more strokes!

Contextual Learning

Find a 'Lifehack' video on Japanese YouTube and count how many times they say 'kouritsu yoku'. It's a great listening exercise.

Business Etiquette

In a Japanese interview, saying you value working 'kouritsu yoku' is a huge plus, as it suggests you won't waste company resources.

Adverb Placement

While Japanese word order is flexible, putting 'kouritsu yoku' right before the verb is the safest and most natural choice.

Antonym Practice

Practice using 'kouritsu waruku' to describe annoying bureaucracy or bad habits to understand the full spectrum of the word.

The 'Rate' Connection

Remember that 'ritsu' means rate. Efficiency is just a 'good rate' of work.

Pitch Accent

Listen for the drop in pitch after 'kou'. If you keep it high, it might sound like a different word.

Kitchen Efficiency

Describe your cooking steps out loud in Japanese using 'kouritsu yoku' to build muscle memory.

Mémorise-le

Moyen mnémotechnique

Think of 'Kouritsu' as 'CO-RE-ITS' (Core-its). The 'Core' of a good 'Rate' is efficiency. Then add 'Yoku' (Well). 'Core-rate well' = 効率よく.

Association visuelle

Imagine a factory belt where every item lands perfectly in a box without any falling off. That 'Rate' (ritsu) of 'Effect' (kou) is 'Good' (yoku).

Word Web

Jikan (Time) Muda (Waste) Shigoto (Work) Benkyou (Study) Saiteki (Optimal) Kezuru (To cut/shave off) Yosan (Budget) Seika (Results)

Défi

Try to describe your morning routine using 'kouritsu yoku'. For example: 'I brush my teeth while the coffee is brewing to use time efficiently.'

Origine du mot

The word 'kouritsu' (効率) is a Sino-Japanese (Kango) compound. 'Kou' (効) means 'effect', 'benefit', or 'efficacy'. 'Ritsu' (率) means 'rate', 'ratio', or 'proportion'. Together, they literally mean 'the rate of effect'.

Sens originel : The term was popularized during the modernization of Japan (Meiji era) as a translation for Western economic and engineering concepts of efficiency.

Sino-Japanese (Kango)

Contexte culturel

Be careful not to over-emphasize efficiency in creative or grieving processes, where taking time is considered respectful and necessary.

In English, 'efficiently' can sometimes sound a bit cold or mechanical. In Japanese, 'kouritsu yoku' is generally a very positive, sought-after trait in both personal and professional life.

Toyota Production System (TPS) - The origin of 'muda' (waste) elimination. The 80/20 Rule (Pareto Principle) - Often discussed in Japanese as a way to work 'kouritsu yoku'. Productivity gurus like Marie Kondo - While she focuses on tidying, the goal is often to live more 'kouritsu yoku'.

Pratique dans la vie réelle

Contextes réels

At the Office

効率よく作業する
効率よく会議を進める
効率よくメールをさばく
効率よく優先度をつける

Studying for Exams

効率よく暗記する
効率よく復習する
効率よく過去問を解く
効率よくノートを取る

Housework

効率よく料理を作る
効率よく洗濯物を干す
効率よく買い物リストを作る
効率よくゴミを分別する

Fitness/Sports

効率よく脂肪を燃やす
効率よく筋肉をつける
効率よくエネルギーを補給する
効率よくフォームを改善する

Technology/Gaming

効率よくレベルを上げる
効率よくアイテムを集める
効率よくデータを同期する
効率よくバッテリーを節約する

Amorces de conversation

"どうすればもっと効率よく日本語を覚えられますか？ (How can I memorize Japanese more efficiently?)"

"仕事の効率よく進めるための、おすすめのアプリはありますか？ (Do you have any recommended apps for advancing work efficiently?)"

"朝の時間を効率よく使うために、何から始めればいいですか？ (What should I start with to use my morning time efficiently?)"

"料理を効率よく作るために、いつも工夫していることはありますか？ (Is there anything you always do to make cooking more efficient?)"

"このプロジェクトを効率よく進めるには、誰の助けが必要ですか？ (Whose help do we need to proceed with this project efficiently?)"

Sujets d'écriture

今日は時間を効率よく使えましたか？その理由を書いてください。 (Did you use your time efficiently today? Write down why.)

もっと効率よく学びたいことは何ですか？そのための計画を立てましょう。 (What is something you want to learn more efficiently? Let's make a plan for it.)

あなたの「効率よく働くためのルール」を3つ挙げてください。 (List three of your 'rules for working efficiently'.)

効率を求めすぎて、失敗した経験はありますか？ (Have you ever failed because you sought efficiency too much?)

将来、AIが私たちの仕事をどう効率よく変えると思いますか？ (How do you think AI will change our work efficiently in the future?)

Questions fréquentes

10 questions

They mean the same thing, but 'kouritsuteki ni' is more formal and technical. 'Kouritsu yoku' is preferred in daily conversation and spoken advice.

Yes, but it describes their action, not their personality. You say 'He works efficiently' (kouritsu yoku hataraku), not 'He is an efficient person' (though you could use 'kouritsuteki na hito' for that).

Generally no, but if someone is *too* focused on efficiency, they might be criticized for being 'robotic' or 'cold'. Context matters.

You can say 'kouritsu waruku' (efficiency is bad) or 'hi-kouritsuteki ni' (inefficiently).

Tsukau (use), Hataraku (work), Benkyou suru (study), Susumeru (advance), and Konasu (manage tasks).

Yes, 'okane o kouritsu yoku tsukau' means to spend money in a way that gives you the best value or return.

It is officially considered N3 level, but it is essential vocabulary for anyone living or working in Japan (B1 level).

Absolutely. It describes using your body in a way that doesn't waste energy, like a 'kouritsu yoku' swimming stroke.

For 効, think of 'exchange' + 'power'. For 率, it looks like a person standing under a hat with small markings below.

You can say 'kouritsu ga yoi' (efficiency is good), but to modify a verb, you must use the adverbial 'kouritsu yoku'.

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