Synonyms and related words :
artfulness, clandestine behavior, clandestinity, covertness, craft, cunning, deceit, deceitfulness, duplicity, falseheartedness, falseness, guile, hypocrisy, indirection, insidiousness, prowl, prowling, shiftiness, slinkiness, slyness, sneak attack, sneakiness, stalking, stealth, stealthiness, surreptitiousness, treacherousness, underground activity, underhand dealing, underhandedness