mischiefmaking (noun) monkey business: shenanigans
Sinonime: advised, aforethought, contemplated, designed, designful,
examined,
express, given due consideration, gone into,
intentional, investigated, mediated, premeditated, prepense, studied,
studious, thought-about, thought-through, treated,
voluntary, weighed, well advised, well chosen, willful
Antonime: disregarded,
forgotten,
neglected,
unplanned, unstudied