noun, noun which may take the genitive case particle 'no'
immaturity; unripeness
Refers to a state of not being fully developed, whether physically, mentally, or in terms of skills. Often used in formal or written contexts. Antonym: 成熟 (maturity).
Antonyms: 成熟
彼の考え方はまだ未成熟だ。
His way of thinking is still immature.
未成熟な果実は収穫できない。
Unripe fruit cannot be harvested.
Similar meaning of immaturity or inexperience, but 未熟 is more common in everyday language and often refers to skill or experience, while 未成熟 can sound more formal or biological.
Compound of 未 (mi, 'not yet') and 成熟 (seijuku, 'maturity'). The prefix 未- negates the state of being mature.