成熟|せいじゅくseijuku[0]heiban (flat)
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- noun, suru verb, intransitive verbmaturity; ripeness
Conjugation
| Dictionary form | 成熟する(せいじゅくする) |
|---|---|
| Polite (masu) | 成熟します(せいじゅくします) |
| Negative (nai) | 成熟しない(せいじゅくしない) |
| polite (masen) | 成熟しません(せいじゅくしません) |
| classical zu / nu | 成熟せず・成熟せぬ(せいじゅくせず・せいじゅくせぬ) |
| Past (ta) | 成熟した(せいじゅくした) |
| polite (mashita) | 成熟しました(せいじゅくしました) |
| Past negative (nakatta) | 成熟しなかった(せいじゅくしなかった) |
| polite (masen deshita) | 成熟しませんでした(せいじゅくしませんでした) |
| Te form | 成熟して(せいじゅくして) |
| Potential | 成熟できる(せいじゅくできる) |
| Passive | 成熟される(せいじゅくされる) |
| Causative | 成熟させる(せいじゅくさせる) |
| Causative passive | 成熟させられる(せいじゅくさせられる) |
| Conditional (ba) | 成熟すれば(せいじゅくすれば) |
| tara | 成熟したら(せいじゅくしたら) |
| Volitional | 成熟しよう(せいじゅくしよう) |
| polite (mashou) | 成熟しましょう(せいじゅくしましょう) |
| Imperative | 成熟しろ(せいじゅくしろ) |
Common forms generated by rule; see the senses for honorific or irregular usage.
- Synonym熟成じゅくせいNeutralUsed for wine, meat, cheese etc. gaining flavor as they age, and for ideas or the moment slowly coming to fruition; 「成熟」 covers living things, character, or timing.
- Synonym円熟えんじゅくNeutralPolished, seasoned mastery of an art or personality, as in 「円熟した演技」; 「成熟」 is the broader word.
- Synonym完熟かんじゅくNeutralComplete ripeness of fruit; 「成熟」 also covers character and timing.
- Synonym老成ろうせいNeutralBeing mature beyond one's years or seasoned with experience; 「成熟」 is more neutral in tone.
- Synonym老熟ろうじゅくWrittenA written, rare word for seasoned maturity from long experience; in everyday speech use 「成熟」 or 「円熟」.
- Related実るみのるNeutralA verb: to bear fruit or for efforts to pay off. 「成熟」 is about reaching a mature state, and can be used as 「成熟する」.
- Related熟すじゅくすNeutralA verb: fruit ripening, the time being ripe, or a word becoming established through use. 「成熟」 is a noun that also takes 「する」 and covers character and mind.
- Related熟するじゅくするWrittenA written variant of 「熟す」; 「成熟」 can also describe the maturing of character and mind.
- Related熟れるうれるNeutralA verb for fruit or grain becoming fully ripe and ready to eat; 「成熟」 also covers character and timing.
- Related大人びるおとなびるNeutralSaid of a child seeming grown-up; 「成熟」 is real maturity.
- Related練れるねれるNeutralDough being well kneaded, or a person becoming seasoned and polished; 「成熟」 is the broader term.
- Related熟むうむWrittenAn archaic, written word for ripening, rare today; say 「熟れる」 in everyday speech.
- Antonym未熟みじゅくNeutralThe opposite of 「成熟」: unripe fruit, or an immature, inexperienced person.
- Antonym幼いおさないNeutralThe opposite of 「成熟」 in age and mind: very young or childish.
- Antonym稚いいとけないWrittenA literary word, opposite to 「成熟」 in age and mind: young and innocent.
Default to 「成熟」 for living things ripening, a mature character, or the right timing. Use 「熟成」 for aging wine, meat or cheese, 「円熟」 for polished skill, 「熟れる」 or 「完熟」 for fruit fully ripe, and 「大人びる」 for a child seeming grown-up. Antonyms: 「未熟」, 「幼い」.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only


