How to say "immature" in Japanese

Choosing the right word
  • 未熟みじゅくJLPT N1approx.Common
    na-adjective, nounCovers both literal unripeness of fruit and figurative immaturity in ability, skill, or experience. Typical when saying someone's technique or judgment is not yet fully developed.
  • 稚拙ちせつCommon
    na-adjective, nounApplied to work or technique that is unskillful, naive, or immature, such as a childlike drawing or clumsy writing. Rarely the word for an immature person; it evaluates skill or craftsmanship.
  • 若いわかいJLPT N5approx.Common
    i-adjectiveChiefly means young, and its 'immature, green' sense is that of someone still young and inexperienced. Usually not the word you want for criticize-worthy immaturity; for that use 幼稚 or 未熟.
  • 幼稚ようちJLPT N2approx.Common
    na-adjective, nounDescribes childish, infantile, or immature behavior and reasoning, often with a critical tone, as in immature attitudes or arguments. Also has the 'primitive' sense for undeveloped ideas or methods.
    幼稚ようちな説得せっとくとは、人ひとをしつこく唆そそのかすことだ。↗
    Crude persuasion is to persistently egg someone on.
  • 幼いおさないJLPT N3approx.Common
    i-adjectiveMostly means very young or childish in the sense of being childlike. As 'immature' it suggests a still-childish quality in a person rather than a criticism of skill or judgment.
    彼かれの考かんがえはとても幼おさない。↗
    His way of thinking is very childish.

Use 未熟 for literal unripeness or lack of skill, 幼稚 or 「幼い」 for childish behavior, 稚拙 for naive unskillful work, and 「若い」 mostly for the 'green, still young' sense.

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

Japanese equivalents
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JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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