How to say "folly" in Japanese

• 愚行ぐこうCommon
  nounCovers 'folly' as a countable deed: a foolish act. Use it when criticizing or regretting a specific unwise action or undertaking — the deed itself, not foolishness as a general quality.
  愚行ぐこうなしに生いきている人ひとは、その人ひとが考かんがえているほど賢明けんめいではない。↗

  Who lives without folly is not so wise as he thinks.
• 愚ぐCommon
  noun, na-adjectiveNames foolishness as a quality or state — silliness, stupidity — rather than any single act. Choose it when 'folly' means that abstract condition, as in acknowledging one's own foolishness.
  知しらないほうが幸しあわせな場合ばあいには、知しることは愚ぐである。↗

  Where ignorance is bliss, 'tis folly to be wise.

Use 愚行 for 'folly' meaning a specific foolish act or deed, and 愚 for 'folly' meaning the abstract quality of foolishness, silliness, or stupidity rather than any one action.

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

• 愚行ぐこうfoolish act
• 愚ぐfoolishness
• こけfolly
• フォリーfolly