Roget's Thesaurus: Entry 941 (Knave)

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#941. Knave. -- N. knave, rogue; Scapin[obs], rascal; Lazarillo de Tormes; bad man &c. 949; blackguard &c. 949; barrater[obs], barrator[obs]; shyster [U.S..].

traitor, betrayer, archtraitor[obs], conspirator, Judas, Catiline; reptile, serpent, snake in the grass, wolf in sheep's clothing, sneak, Jerry Sneak, squealer*, tell-tale, mischief-maker; trimmer, fence-sitter, renegade &c. (tergiversation) 607; truant, recreant; sycophant &c. (servility) 886.