immature
in- ‘not’ + maturus ‘ripe’ (see mature)
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adjective
not fully developed:
〈植物･細胞などが〉未熟な; 未完成な, 未発達の
e.g. many of the fish caught are immature
e.g. immature fruit.
having or showing an emotional or intellectual development appropriate to someone younger:
〈人･言動などが〉未成熟な, 幼稚な
e.g. his immature sense of humor.
DERIVATIVES
immaturely |ˌiməˈto͝o(ə)rlē, ˌiməˈCHo͝o(ə)rlē| adverb
ORIGIN
mid 16th century (in the sense ‘premature’, referring to death): from Latin immaturus ‘untimely, unripe’, from in- ‘not’ + maturus ‘ripe’ (see mature).