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.
彼女のあだな微笑みに、誰もが心を奪われた。
Everyone was captivated by her coquettish smile.
あだと笑うその仕草が、妙に色っぽかった。
That gesture of smiling charmingly was strangely seductive.
nari-adjective (archaic / formal), taru-adjective
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.
古典文学では、「婀娜」を「あだ」と読み、優美な様子を表した。
In classical literature, 婀娜 was read as あだ and expressed a graceful appearance.