braveyoudaoicibaDictYouDict[brave 词源字典]
brave: [15] The word which today means ‘courageous’ comes from one which meant ‘uncivilized, savage, wild’. English acquired brave via French brave, Italian bravo, and Vulgar Latin *brabus from Latin barbarus, source, via a different route, of English barbarous. Also from the Italian form come the exclamation bravo [18] and its derivative bravura [18], while Spanish bravada has contributed bravado [16].
=> bravado, bravo, bravura[brave etymology, brave origin, 英语词源]
brave (adj.)youdaoicibaDictYouDict
late 15c., from Middle French brave, "splendid, valiant," from Italian bravo "brave, bold," originally "wild, savage," possibly from Medieval Latin bravus "cutthroat, villain," from Latin pravus "crooked, depraved;" a less likely etymology being from Latin barbarus (see barbarous). A Celtic origin (Irish breagh, Cornish bray) also has been suggested.

Old English words for this, some with overtones of "rashness," included modig (now "moody"), beald ("bold"), cene ("keen"), dyrstig ("daring"). Brave new world is from the title of Aldous Huxley's 1932 satirical utopian novel; he lifted the phrase from Shakespeare ("Tempest" v.i.183).
brave (v.)youdaoicibaDictYouDict
"to face with bravery," 1776, from French braver, from brave (see brave (adj.)). Related: Braved; braving.
brave (n.)youdaoicibaDictYouDict
"North American Indian warrior," c. 1600, from brave (adj.), and compare bravo.