How to say "whim" in Japanese

Choosing the right word
  • 気まぐれきまぐれJLPT N1approx.Common
    nounCovers the capricious sense of 'whim': acting or changing according to passing fancy, as in fickle weather or a person whose plans shift unpredictably. It describes this changeable quality rather than any single idea.
    私わたしたちがポルトガルへ行いこうと決きめたのはまったくの気きまぐれだった。↗
    Our decision to go to Portugal was quite arbitrary.
  • 恣意しいCommon
    nounReally means arbitrariness or self-will — decisions made on personal discretion without justification, as in criticism of arbitrary official or corporate actions. It is seldom the word you want for a light, playful whim.
  • 思いつきおもいつきJLPT N1approx.Common
    nounCovers 'whim' as a sudden idea or impulse: something you do on the spur of the moment, like a spontaneous trip or purchase. It emphasizes the thought popping into mind rather than a changeable temperament.
    それについて一ひとつ思おもいつきを言いってもいいですか。↗
    May I make a suggestion about it?

Use 「気まぐれ」 for changeable, capricious behavior, 「思いつき」 for a sudden idea or impulse, and 恣意 mainly for arbitrariness or self-will rather than a light, passing fancy.

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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