How to say "willing" in Japanese

• 気さくきさくCommon
  na-adjectiveReally describes a person's character: friendly, openhearted, easy to talk to. 'Willing' fits only loosely, suggesting an unreserved, easygoing readiness, so it is seldom the word you want for agreeing to do something.
  ある意味いみでは、丁寧ていねい語ごは気きさくな雰囲気ふんいきを壊こわす。↗

  Polite language, in a sense, spoils a casual atmosphere.
• やぶさかでない
  expression, i-adjectiveA set phrase meaning willing or ready to do something, affirming willingness by denying reluctance; identical to やぶさかではない except for the omitted particle は. Stiff and deferential; typical of announcements or business writing.
• やぶさかではない
  expression, i-adjectiveA set phrase meaning willing or ready to do something, affirming willingness by denying reluctance; identical to やぶさかでない except for the added particle は. Stiff and deferential; typical of announcements or business writing.

Only the less common set phrase 「やぶさかでない」 or 「やぶさかではない」 — identical but for the particle は — truly expresses being willing to do something; 「気さく」 means friendly and openhearted, covering 'willing' only loosely.

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

• 気さくきさくfriendly
• やぶさかでないready (to do)
• やぶさかではないready (to do)
• 気持ちいいきもちいいagreeable
• 気持ちがいいきもちがいいagreeable