planned

unforeseen, unscheduled, unexpected, unanticipated, unpredicted, unforeseeable, spontaneous, unavoidable, avoidable, uncontrolled, unpreventable, untimely, serendipitous, unintended, inexplicable, haphazard, untoward, infrequent, unnecessary, inadvertent, abrupt, ungraceful, impromptu, uncoordinated, unintentional, catastrophic, impulsive, unsystematic, foreseeable, uneventful, unexplained, undesired, unproductive, unprepared, aborted, unpremeditated, inevitable, unrehearsed, thoughtless, accidental, unfortunate, undesirable, unpleasant, hasty, sudden, unpredictable, calamitous, undesigned, atypical, subsequent, fortuitous, inconvenient, unlooked, planned, evitable, disastrous, interrupt, imprudent, unsustained, awkward, unrelated, breech birth, unbudgeted, unnatural, insignificant, routine, misfortunate, regrettable, uncontrollable, improvident, unwelcome, unessential, unjustifiable, extravagant, predictable, adverse, precipitious, embarrassing, inadequate, incidental, abnormal, nocturnal, chaotic, eventless, irresponsible, predicable, inconsequential, incompetent cervix, needless, apneic, occasional, consequent, hypoglycaemic, bizarre, synchronistic, involuntary, intolerable, unwarranted, caesarian, uncompleted, trivial, unstimulating, detrimental, beneficial, deleterious, expectable, nonroutine, actual, anticipated

improvisation, mess around, monkey, monkey around, muck about, muck around, potter, putter, spin off, temporary expedient, tinker

accidental, ad hoc, casual, chance, unexpected, unintended, unintentional, unpremeditated, unwitting