taru-adjective, adverb taking the 'to' particle
graceful; slim and beautiful
Literary, classical adjective describing a woman's graceful, slender beauty. Used with たる or と adverbial forms.
彼女の立ち姿は嬋娟たるものだった。
Her standing figure was graceful and beautiful.
嬋娟とした女性が庭を歩いていた。
A slim and beautiful woman was walking in the garden.
The exact derivation is uncertain; the kanji 嬋娟 and 嬋妍 are rare and associated with classical Chinese descriptions of feminine beauty.