Knave
Nouns
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knave, rogue
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Scapin, rascal
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Lazarillo de Tormes
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bad man etc. Bad Man
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blackguard etc. Bad Man
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barrater, barrator
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shyster [U.S.]. traitor, betrayer, archtraitor, conspirator, Judas, Catiline
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reptile, serpent, snake in the grass, wolf in sheep's clothing, sneak, Jerry Sneak, squealer [Slang], tell-tale, mischief-maker
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trimmer, fence-sitter, renegade etc. (tergiversation) Tergiversation
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truant, recreant
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sycophant etc. (servility) Servility.