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fugacious (adj.)[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]