c. 1300, revilen, "debase, degrade" (a sense now obsolete);" mid-14c., "insult, taunt, vilify, assail with abusive language," from Old French reviler "consider vile, despise, scorn," from re-, here perhaps an intensive prefix (see re-), + aviler "make vile or cheap, disesteem," from vil "shameful, dishonorable; low-born; cheap; ugly, hideous" (see vile (adj.)). Related: Reviled; reviler; reviling.
late 14c., "a heathen, a Saracen, a pagan, an unbeliever, a non-Christian," from miscreant (adj.) or from Old French mescreant, which also had a noun sense of "infidel, pagan, heretic." Sense of "villain, vile wretch, scoundrel" is first recorded 1590 in Spenser.
c. 1300, "non-Christian, misbelieving, pagan, infidel;" early 15c., "heretical, unbelieving," from Old French mescreant "disbelieving" (Modern French mécréant), from mes- "wrongly" (see mis- (2)) + creant, present participle of creire "believe," from Latin credere "to believe" (see credo). Meaning "villainous, vile, detestable" is from 1590s. Related: Miscreance; miscreancy.