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warlock: warlock: [OE] Etymologically, a warlock is a ‘liar on oath’, and hence a ‘traitor’ or ‘deceiver’. Indeed, the word originally meant ‘traitor’ in English. It soon broadened out into a general term of abuse, and it was also used as an epithet for the ‘Devil’, but the modern sense ‘evil sorcerer’ did not emerge until the 14th century. It started life as a compound noun formed from wǣr ‘faith, pledge’ (a relative of English very and German wahr ‘true’) and -loga ‘liar’ (a derivative of lēogan, the ancestor of modern English lie).
=> lie, very
deceive (v.): c. 1300, from Old French decevoir "to deceive" (12c., Modern French décevoir), from Latin decipere "to ensnare, take in, beguile, cheat," from de- "from" or pejorative + capere "to take" (see capable). Related: Deceived; deceiver; deceiving.
fraud (n.): mid-14c., "criminal deception" (mid-13c. in Anglo-Latin); from Old French fraude "deception, fraud" (13c.), from Latin fraudem (nominative fraus) "a cheating, deceit," of persons "a cheater, deceiver." Not in Watkins; perhaps ultimately from PIE *dhreugh- "to deceive" (cognates: Sanskrit dhruti- "deception; error"). Meaning "a fraudulent production, something intended to deceive" is from 1650s. The meaning "impostor, deceiver, pretender; humbug" is attested from 1850. Pious fraud (1560s) is properly "deception practiced for the sake of what is deemed a good purpose;" colloquially used as "person who talks piously but is not pious at heart."
gab (v.): "talk much," 1786, probably via Scottish and northern England dialect from earlier sense "speak foolishly; talk indiscreetly" (late 14c.), from gabben "to scoff, jeer; mock (someone), ridicule; reproach (oneself)," also "to lie to" (late 13c.), from a Scandinavian source, such as Old Norse gabba "to mock, make fun of," and probably in part from Old French gaber "to mock, jest; brag, boast," which, too, is from Scandinavian. Ultimately perhaps imitative (compare gabble, which might have shaded the sense of this word). Gabber was Middle English for "liar, deceiver; mocker." Related: Gabbed; gabbing.
hornblende (n.): 1796, from German Hornblende, from horn (see horn (n.)) + blende (see blende).
The term "Hornblende" is an old German name for any dark, prismatic crystal found with metallic ores but containing no valuable metal (the word "Blende" indicates "a deceiver") [Herbert Bucksch, "Dictionary Geotechnical Engineering," 1995]
Sinon: name of the Greek who induced the Trojans to take the wooden horse into the city; hence "a deceiver by false tales."
traitor (n.): c. 1200, "one who betrays a trust or duty," from Old French traitor, traitre "traitor, villain, deceiver" (11c., Modern French traître), from Latin traditor "betrayer," literally "one who delivers," agent noun from stem of tradere "deliver, surrender" (see tradition). Originally usually with a suggestion of Judas Iscariot; especially of one false to his allegiance to a sovereign, government, or cause from late 15c.
treacherous (adj.): early 14c., from Old French trecheros, tricheros "deceitful" (12c.), from trecheor, tricheor "cheat, deceiver, liar, impostor, trickster," agent noun from trechier, trichier "to cheat, trick" (see trick (n.)). Figuratively, of things, from c. 1600. Related: Treacherously; treacherousness. Middle English had treacher "deceiver, cheat, traitor."
warlock (n.): Old English wærloga "traitor, liar, enemy, devil," from wær "faith, fidelity; a compact, agreement, covenant," from Proto-Germanic *wera- (cognates: Old High German wara "truth," Old Norse varar "solemn promise, vow"), from PIE *were-o- "true, trustworthy" (see very, also Varangian). Second element is an agent noun related to leogan "to lie" (see lie (v.1); and compare Old English wordloga "deceiver, liar").

Original primary sense seems to have been "oath-breaker;" given special application to the devil (c. 1000), but also used of giants and cannibals. Meaning "one in league with the devil" is recorded from c. 1300. Ending in -ck (1680s) and meaning "male equivalent of a witch" (1560s) are from Scottish. Related: Warlockery.
affronter: "A person who affronts or insults another; a person who causes offence", Late 16th cent.; earliest use found in John Florio (1553–1625), author and teacher of languages. From affront + -er, in sense 1 after Middle French, French affronteur deceiver, impostor.