nifty (adj.)youdaoicibaDictYouDict[nifty 词源字典]
"smart, stylish," 1868, of unknown origin, perhaps theatrical slang, first attested in a poem by Bret Harte, who said it was a shortened, altered form of magnificat. Related: Niftily; niftiness.[nifty etymology, nifty origin, 英语词源]