Translation guide
The English word "proficiency" refers to a high degree of skill or competence in a particular area. In Japanese, there is no single direct equivalent that covers all uses. The most common and natural way to express proficiency is with the noun 熟練 (jukuren) for general skill mastery, or by using the adjective 上手 (jouzu) for being good at something. For language proficiency, specific terms like 能力 (nouryoku) or 技能 (ginou) are used in formal contexts. This guide organizes the concept by the type of proficiency being described.
Describing a high level of skill in a craft, profession, or activity, often gained through experience.
A noun meaning 'skillfulness' or 'expertise' acquired through long practice. Often used in formal or written contexts.
彼の熟練した技術は素晴らしい。
His proficient skills are wonderful.
この仕事には熟練が必要だ。
This job requires proficiency.
A na-adjective meaning 'good at' or 'skilled'. Very common in everyday speech. Use with the particle が to indicate what someone is proficient at.
A na-adjective or noun meaning 'proficient' or 'adept', often implying a high level of skill and sometimes enjoyment. Slightly formal.
A na-adjective meaning 'skillful' or 'proficient', often used for language or physical skills. Can sound slightly old-fashioned or colloquial.
Specifically referring to ability in a foreign language, often in formal or testing contexts.
Means 'ability' or 'capability'. Commonly used in phrases like 語学能力 (language proficiency) or 日本語能力 (Japanese proficiency).
日本語能力試験を受けた。
I took the Japanese Language Proficiency Test.
彼は高い語学能力を持っている。
He has high language proficiency.
Means 'technical skill' or 'proficiency'. Often used in official names like 日本語技能試験 (Japanese Proficiency Test).
A compound meaning 'language ability' or 'linguistic proficiency'. Common in educational and professional settings.
An onomatopoeic adverb/na-adjective meaning 'fluent' or 'speaking smoothly'. Very common in casual conversation about language proficiency.
Describing competence in a specialized field, often with certification or measurable standards.
A noun or suru-verb meaning 'proficiency' or 'mastery' through learning. Often used in technical or professional contexts.
彼はその技術に習熟している。
He is proficient in that technology.
A noun or suru-verb meaning 'being well-versed' or 'having expertise'. Implies deep knowledge.
Also used for professional skills, similar to general proficiency but with a nuance of high competence.
Referring to a degree or standard of proficiency, often in tests or frameworks.
A noun meaning 'level of proficiency' or 'skill level'. Used in games, training, and professional development.
熟練度が上がった。
My proficiency level increased.
Similar to 熟練度, meaning 'degree of proficiency' or 'mastery level'. Often used in educational contexts.
習熟度別クラス
classes divided by proficiency level
A straightforward compound meaning 'ability level'. Common in business and language learning.
能力レベルに応じた研修
training according to proficiency level
上手 (jouzu) is the most common and casual way to say someone is good at something. 熟練 (jukuren) emphasizes skill acquired through long experience and is more formal. 堪能 (tannou) implies both proficiency and often enjoyment, and is slightly formal. For everyday conversation about being good at a hobby, use 上手. For professional expertise, 熟練 or 精通 (seitsuu) are better.
彼はギターが上手だ。
He is good at guitar. (casual)
彼は熟練した職人だ。
He is a proficient craftsman. (formal)
English 'proficiency' is often used as an abstract noun (e.g., 'language proficiency'). In Japanese, it is more natural to use specific ability words like 能力 (nouryoku) or 力 (ryoku) in compounds, or to rephrase with adjectives like 上手 (jouzu) or verbs like できる (dekiru). Directly translating 'proficiency' as 熟練 or 堪能 in all contexts can sound unnatural.
日本語ができます。
I am proficient in Japanese. (natural)
日本語の能力があります。
I have Japanese proficiency. (formal)
彼の英語の能力は素晴らしい。
His proficiency in English is remarkable.
熟練度を上げたい。
I want to improve my proficiency.
彼女は料理が上手だ。
She is proficient at cooking.
日本語が上手ですね。
You're proficient in Japanese, aren't you?
彼は英語に堪能だ。
He is proficient in English.
He is a smooth talker (proficient in speaking).
Practical Japanese Proficiency Test
語学力を伸ばしたい。
I want to improve my language proficiency.
彼は日本語がペラペラだ。
He is fluent (proficient) in Japanese.
彼は法律に精通している。
He is proficient in law.
彼女はプログラミングに堪能だ。
She is proficient in programming.