mischief

diabolicalness, misbehavior, misconduct, naughtiness, troublemaking

buffoonery, friskiness, playfulness, sportiveness

chicanery, trickery

goings-on, hanky-panky, high jinks (also hijinks), monkey business, monkeying, monkeyshine(s), skylarking, tomfoolery

horseplay, roughhousing

antic, caper, dido, practical joke, trick

coyness, kittenishness

archness, devilment, devilry (or deviltry), hob, rascality, roguishness, waggery

devilishness, diabolicalness, knavery

frivolousness

energy, liveliness, spiritedness, sprightliness, spunkiness, vivaciousness, vivacity

gaiety (also gayety), jocularity, jocundity, lightheartedness, mirthfulness, whimsicality

cutup, madcap, skylarker

brat, nuisance

juvenile delinquent

gamin, gamine