"with bad fame, dishonorable," 1570s, from in- (1) "not, opposite of" + glorious. Latin ingloriosus meant "without fame, unhonored, inconspicuous, without trophies." The classical sense "without fame, obscure" is attested in the English word from 1590s but is marked "rare" in OED. Related: Ingloriously; ingloriousness.
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