熟練|じゅくれんjukuren[0]heiban (flat)

1. noun, suru verb, intransitive verbskill; expertise; experience; proficiency; mastery; dexterity
   彼かれはそのゲームに熟練じゅくれんしていた。↗

   He was an old hand at the game.

• Synonym老練ろうれんNeutralSeasoned and deft through long experience, as in 「老練な政治家」. Stresses accumulated experience and savvy, while 「熟練」 stresses skilled technique.
• Synonym上手じょうずNeutralThe everyday word for being good at something. 「熟練」 specifically highlights proficiency built up through long practice.
• Synonym堪能たんのうNeutralProficient or well-versed, most often said of language ability, as in 「英語に堪能」. Can also mean enjoying something to the full.
• Synonym熟達じゅくたつWrittenWritten word for mastery: skill brought to full command. Rarer than 「熟練」 and close to it, but stresses attaining a high level of technique.
• Related精通せいつうNeutralBeing well versed in a subject, as in 「法律に精通」. Centers on thorough knowledge; 「熟練」 centers on skilled performance.
• Related体得たいとくNeutralGrasping something by experiencing it yourself. Stresses internalizing the knack through practice, without judging how skilled you have become.
• Related習熟しゅうじゅくNeutralBecoming proficient through repeated practice, as in 「操作に習熟する」. Highlights the gradual process of getting skilled rather than the state itself.
• Related老巧ろうこうWrittenWritten word meaning seasoned and experienced. Rare; stresses shrewdness and seasoned methods rather than skill itself.
• Related慣れたなれたCasualColloquial prenominal form meaning practiced and familiar with a task, as in 「慣れた手つき」. Suggests a milder degree of skill than 「熟練」.
• Related手練しゅれんWrittenWritten word for superb technique honed over years of training. Rare; in everyday speech 「熟練」 is the normal choice.
• Related手練れてだれNeutralSuperb skill, or the highly skilled person himself — an expert in any field. 「熟練」 focuses on the proficiency itself.
• Antonym未熟みじゅくNeutralAntonym: immature or unskilled for lack of training and experience. The direct opposite of 「熟練」.
• AntonymウブNeutralGreen and unsophisticated, often with little romantic experience. Contrasts with seasoned worldliness only; it does not mean lacking skill.

Use 「熟練」 for skill honed by long practice, as in 「熟練した通訳」. In daily talk say 「上手」; for seasoned experience 「老練」; for language ability 「堪能」; for deep knowledge 「精通」. 「未熟」 is the antonym. 「熟達」「老巧」「手練」 are rarer written options.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 十分じゅうぶんに経験けいけんを積つんでいて巧たくみなこと。