köken: Borrowed from Russian Church Slavonic *восторженый (*vostorženyj), originally past passive participle of восторгнꙋти (vostorgnuti, “to pull out”); compare отве́рженный (otvéržennyj), originally past passive participle of отве́ргнуть (otvérgnutʹ).
köken: First attested in the Seokbo sangjeol (釋譜詳節 / 석보상절), 1447, as Middle Korean 깃브다 (Yale: kìs-pù-tá). Originally Middle Korean 기ᇧ다〮 (kìsktá, “to rejoice”) + -브- (-pù-, adjective-deriving suffix), hence literally "rejoiceful; rejoice-worthy", but the original verb is obsolete and the word is now perceived as monomorphemic. 기껍다 (gikkeopda) is from the same etymon.