deft (adj.)youdaoicibaDictYouDict[deft 词源字典]
Old English gedæfte "mild, gentle," differentiated in Middle English into daft (q.v.) and this word, via sense of "apt, skillful, adept." Cognate with Gothic gadaban "to be fit," Old Norse dafna "to grow strong," Dutch deftig "important, relevant."[deft etymology, deft origin, 英语词源]