Noah Webster's Dictionary 1. (n.) A boy; especially, a boy servant. 2. (n.) Any male servant; a menial. 3. (n.) A tricky, deceitful fellow; a dishonest person; a rogue; a villain. 4. (n.) A playing card marked with the figure of a servant or soldier; a jack.

Multi-Version Concordance Knave (2 Occurrences) Isaiah 32:5 The foolish man will no longer be named noble, and they will not say of the false man that he is a man of honour. (See RSV) Isaiah 32:7 The designs of the false are evil, purposing the destruction of the poor man by false words, even when he is in the right. (See RSV)