mis·chief 
/ˈmɪstʃəf/ noun
/ˈmɪstʃəf/ noun [noncount] 1 : behavior or activity that is annoying but that is not meant to cause serious harm or damage
▪ Those children are always up to some mischief. = Those children are always getting into mischief. ▪ engaging in mischief ▪ It's hard to keep him out of mischief. 2 : a playful desire to cause trouble
▪ There was (a hint of) mischief in his eyes/smile. 3 somewhat formal : harmful behavior
▪ criminal/malicious mischief
▪ Those children are always up to some mischief. = Those children are always getting into mischief. ▪ engaging in mischief ▪ It's hard to keep him out of mischief.
▪ There was (a hint of) mischief in his eyes/smile.
▪ criminal/malicious mischief
