Synonyms of knave
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blackguardan unprincipled contemptible person; scoundrel
scoundrel (old-fashioned)shit (taboo, slang)bastard (offensive, informal)villainroguebugger (taboo, slang)swinerascalson-of-a-bitch (taboo, slang, US, Canadian)wretchbounder (British, old-fashioned, slang)blighter (British, informal)scumbag (slang)miscreantbad egg (old-fashioned, informal)skelm (South Africa)wrong 'un (informal)
• He's nothing but a rotten cheat.
deceiversharpercheatersharkcharlatantrickstercon man (informal)impostorfraudsterdouble-crosser (informal)swindlergrifter (slang, US, Canadian)rorter (Australian, slang)chiseller (informal)roguedodgerknave (archaic)rogue trader
rascalIf you call a man or child a rascal, you mean that they behave badly and are rude or dishonest.
• What's that old rascal been telling you?
roguedevilvillainscoundrel (old-fashioned)disgracerakepickle (British, informal)impscally (Northwest England, dialect)wretchknave (archaic)ne'er-do-wellreprobatescallywag (informal)good-for-nothingmiscreantscampwastrelbad egg (old-fashioned, informal)blackguardvarmint (informal)rapscallioncaitiff (archaic)wrong 'un (Australian, slang)nointer (Australian, slang)
Thesaurus for knave from the Collins English Thesaurus