How to say "willingly" in Japanese

• 喜んでよろこんでCommon
  adverbThe glad sense of 'willingly': happily agreeing to a request or offer, often as a polite reply meaning 'with pleasure' or 'certainly'. As a common word, it is the default choice for this use.
  喜よろこんでご招待しょうたいに応おうじます。↗

  I will be very happy to accept your invitation.
• 自分からじぶんから
  expressionThe voluntary sense: doing something of one's own accord, on one's own initiative, rather than because someone asked or ordered it. It stresses the absence of outside pressure, not gladness.
• 進んですすんで
  adverbAlso the voluntary sense: acting of one's own free will, stepping forward to do something without waiting to be asked. It overlaps with 自分から and likewise highlights initiative rather than pleasure.
  進すすんで学まなぼうとする気きの無ない者ものには教おしえる甲斐かいがない。↗

  One who is not willing to learn is not worth teaching.
• 好き好んですきこのんで
  expressionThe 'by preference' sense: doing something by choice because one likes it, for the love of it, rather than out of necessity or compliance. It suits chosen effort, not polite acceptance of a request.
• ほいほい
  adverb (with と), suru verbRarely the word you want for 'willingly': it means agreeing or going along readily but thoughtlessly, without due care. Its real sense is careless readiness, so it does not convey glad cooperation.

Use 「喜んで」 for glad compliance ('with pleasure'), 「自分から」 or 「進んで」 for voluntary, self-initiated action, 「好き好んで」 for doing something by personal preference, and avoid 「ほいほい」, which really means thoughtless readiness.

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

• 喜んでよろこんでwith pleasure
• 自分からじぶんからwillingly
• 進んですすんでvoluntarily
• 好き好んですきこのんでby choice
• ほいほいrecklessly
• 快くこころよくwillingly
• 気持ちよくきもちよくwillingly