taru-adjective, adverb taking the 'to' particle
graceful and slender; elegantly slim
Literary, archaic adjective describing a woman's graceful, slender beauty. Used in classical or highly formal writing; not part of everyday speech.
彼女の姿は窈窕として、まるで絵巻物から抜け出たようだった。
Her figure was graceful and slender, as if she had stepped out of a picture scroll.
古典文学では、美女を「窈窕たる佳人」と表現することがある。
In classical literature, a beautiful woman is sometimes described as a 'graceful and slender beauty'.