What is the meaning of Knave?

A boy; especially, a boy servant.

Any male servant; a menial.

A tricky, deceitful fellow; a dishonest person.

A playing card marked with the figure of a servant or a soldier.

son, male child (offspring)

boy, lad, male child or baby

guy, bloke, man

servant, hireling, menial

peasant, lowly individual

infantryman, soldier

knave, caitiff, despicable individual

Source: wiktionary.org