fugacious (adj.)youdaoicibaDictYouDict[fugacious 词源字典]
"fleeing, likely to flee," 1630s, with -ous + Latin fugaci-, stem of fugax "apt to flee, timid, shy," figuratively "transitory, fleeting," from fugere "to flee" (see fugitive). Related: Fugaciously; fugaciousness; fugacity.[fugacious etymology, fugacious origin, 英语词源]