あだ

na-adjective, adverb taking the 'to' particle

coquettish; charming; seductive

Describes a person, especially a woman, who is alluring in a playful, flirtatious, or bewitching way. Often used in literary or slightly old-fashioned contexts.

• 彼かの女じょのあだな微笑ほほえみに、誰だれもが心こころを奪うばわれた。

  Everyone was captivated by her coquettish smile.

• あだと笑わらうその仕し草ぐさが、妙みょうに色いろっぽかった。

  That gesture of smiling charmingly was strangely seductive.

nari-adjective (archaic / formal), taru-adjective

beautiful; graceful

Archaic original meaning, referring to elegant beauty or gracefulness. Now largely replaced by modern synonyms like 美しい or 優雅. Found in classical texts.

• 古こ典てん文ぶん学がくでは、「婀あ娜だ」を「あだ」と読よみ、優ゆう美びな様よう子すを表あらわした。

  In classical literature, 婀娜 was read as あだ and expressed a graceful appearance.