平気|へいきheiki[0]heiban (flat)

1. na-adjective, nouncool; calm; composed; unconcerned; nonchalant; unmoved; indifferent
   彼かれは平気へいきでうそをつく。↗

   He has no scruples about lying.
2. na-adjectiveall right; fine; OK; okay

• Synonym落ち着いたおちついたNeutralCalm, steady and composed; used before a noun as in 「落ち着いた態度」. Points to outward bearing, while 「平気」 is about not caring or being fine.
• Synonym平静へいせいWrittenWritten word for a calm mind or scene, as in 「平静を装う」. Suggests inner serenity and lacks the 'don't care' nuance of 「平気」.
• Synonym沈着ちんちゃくWrittenWritten word for staying calm in a crisis, as in 「沈着冷静」. Complimentary, whereas 「平気」 can carry a negative nuance of indifference.
• Related平穏へいおんWrittenWritten word for peace and stability, as in 「平穏な日々」. Describes life or situations being untroubled, not an uncaring attitude.
• Related穏やかおだやかNeutralMild and gentle in temperament or weather, as in 「穏やかな人」. Leans toward personality and atmosphere; it does not mean 'it's fine'.
• Related静穏せいおんWrittenWritten word for a quiet, stable environment; mostly for weather and social conditions, and rare in everyday speech.
• RelatedのんきNeutralEasygoing, carefree and slow-paced, as in 「のんきな人」. Implies being in no hurry and can carry a critical nuance.
• Antonym不安ふあんNeutralWorry and unease; the opposite of 「平気」, which is about a mind at ease and not caring.
• Antonym心配しんぱいNeutralWorry or concern; opposite of 「平気」, though 「心配ない」 and 「平気だ」 come close in meaning.

Use 「平気」 for being fine, unbothered or indifferent, as in 「平気です」 or 「平気で嘘をつく」. For a composed attitude say 「落ち着いた」; for a stable, peaceful life 「平穏」. The opposites are 「不安」 and 「心配」.

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

1. 落ち着おちついていること。また、そのようなさま。
2. ものに動どうじず、かまわないこと。
3. 太陰たいいん太陽暦たいようれきで二十四にじゅうよん節気せっきを決定けっていする際さい、1太陽年たいようねんの時間じかんを24等分とうぶんし、各かく節気せっきを求もとめる方法ほうほう。平気へいき法ほう。