Roget's Thesaurus: Entry 941 (Knave)

Make sure you have read the copyright information for this Project Gutenberg provided by, as well as the description -

#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.