早熟|そうじゅくsoujuku[0]heiban (flat)

1. na-adjective, no-adjectiveprecocity; early ripening; premature development
   女の子おんなのこは男の子おとこのこより早熟そうじゅくだ。↗

   Girls mature faster than boys.

• RelatedおませCasualColloquial word for a child whose speech and behaviour seem older than their years; more casual than 「早熟」, with a cute, endearing nuance.
• RelatedおしゃまCasualColloquial term for a child acting like a little adult, especially a girl who deliberately acts grown-up; more playful than 「早熟」, and used mostly of girls.
• Antonym奥手おくてNeutralThe opposite of 「早熟」: slow to mature physically or slow to catch on romantically. Neutral register.
• Antonym晩熟ばんじゅくWrittenWritten-register duplicate of the entry above: crops or people that ripen or mature late; the opposite of 「早熟」.
• Antonym晩成ばんせいWrittenWritten word, typically as 「大器晩成」: finishing or succeeding late in life. Opposite to 「早熟」 only in timing, not in development.

Use 「早熟」 for development earlier than one's age, or fruit ripening early, as in 「早熟な子供」. For a child acting grown-up, colloquial 「おませ」 (endearing) or 「おしゃま」 (playful, for girls) fit better. The opposite is 「奥手」; 「晩成」 is written, for late success.

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

1. 年齢ねんれいの割わりに肉体にくたいや精神せいしんの発達はったつが早はやいこと。
2. 果物くだものなどが、ふつうのものより早はやく熟じゅくすること。