knave 
/ˈneɪv/ noun
plural knaves /ˈneɪv/ noun [count] old-fashioned 1 : a dishonest man
▪ fools and knaves 2 : a playing card that ranks below a queen and above a 10 : jack
▪ the knave of hearts
▪ fools and knaves
▪ the knave of hearts
— knav·ish /ˈneɪvɪʃ/ adjective [more knavish; most knavish]
▪ a knavish trick
/ˈneɪvɪʃ/ adjective [more knavish; most knavish] ▪ a knavish trick
