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Definition of felonious : Having the quality of felony; malignant; malicious; villainous; traitorous; perfidious; in a legal sense, done with intent to commit a crime; as, felonious homicide.

Synonyms:

deplorable, nefarious, abominable, wrong, guilty, culpable, condemnable, vile, flagitious, vicious

dishonest, hypocritical, crafty, treacherous, turncoat, insincere, devious, fraudulent, unscrupulous, crooked, dishonorable, prevaricating, underhanded, deceiving, traitorous, untrustworthy, deceitful, cheating, double-faced

depraved, reprehensible, iniquitous, bad, debauched, misdoing, corrupt, improper, degenerate, lawbreaking, scandalous, immoral, sinful, sadistic, black, obnoxious, evildoing, perverse, base, wicked, villainous, shocking, wrongdoing, indecent, damnable, blameworthy, debased, sinister

illicit, illegal, unlawful, unconstitutional, unauthorized, bootleg, offensive, actionable, illegitimate, lawless, verboten, taboo, punishable, criminal, wrongful, unjust, unlicensed, forbidden

Usage examples:

• His nephews, Captains Forster and Montagu, were each accused of a felonious appropriation of property belonging to the crown. - "The History of Tasmania, Volume I (of 2)", John West.
• Of these there were 17, 120 of which the causes were unknown and 3, 204 committed while making a justifiable arrest, in self- defence, or by the insane, so that there were in fact only 42, 488 felonious homicides the causes of which can be definitely alleged. - "Courts and Criminals", Arthur Train.
• For the gracefulest and eruditest orator that ever held forth to genteelest congregation, could not have touched the prisoners by his highest flight of rhetoric as did the earnest, fiery Captain- Sheriff- Chaplain White, who moved aggressively on the wickedness of his felonious audience. - "The Mystery of Metropolisville", Edward Eggleston.