sneakiness

skill in achieving one's ends through indirect, subtle, or underhanded means she was impressed by the sneakiness with which they had planned the surprise party Synonyms artfulness, artifice, caginess (also cageyness), canniness, craft, craftiness, cunningness, deviousness, foxiness, guile, guilefulness, slickness, slyness, cunning, subtleness, subtlety, wilinessRelated Words calculation, care, design; savvy, sharpness, shrewdness; cleverness, ingeniousness, ingenuity, inventiveness; ease, facility, finesse; deceitfulness, duplicity, shiftiness, underhandedness