knaveknave /neɪv/ noun [countable]1British EnglishDGC the playing card with a value between the ten and queenSYN jackthe knave of hearts →card1(7)2old-fashionedDISHONEST a dishonestboy or man —knavish adjectivecunning, knavish tricks —knavishly adverbOriginknaveOld Englishcnafa“boy, male servant”