恬てん然ぜん

taru-adjective, adverb taking the 'to' particle

cool; indifferent; nonchalant; calm

Formal literary term describing someone who remains composed and unruffled, often in a situation where others might react emotionally. Used with と as an adverb or in the たる form as an adjective.

• 彼かれは非ひ難なんされても恬てん然ぜんとしていた。

  He remained cool and indifferent even when criticized.

• 恬てん然ぜんたる態たい度どで交こう渉しょうに臨のぞんだ。

  He approached the negotiation with a calm, nonchalant attitude.