unforeseen, unexpected, unpredicted, unforeseeable, adverse, unplanned, anticipated, unbudgeted, unintended, unfavorable, unavoidable, uncontrollable, foreseeable, related, unpredictable, serendipitous, unrelated, catastrophic, governmental, exogenous, undesired, remediable, unpreventable, inexplicable, nonrecurring, untoward, unfavourable, undesirable, inevitable, inherent, subsequent, significant, extraordinary, offsetting, fortuitous, sudden, unexplained, unusual, apneic, unknowable, incremental, abrupt, unlooked, additional, concomitant, untimely, due, posttranslational, rh incompatibility, atypical, fluctuating, technological, unexplainable, abnormal, inadvertent, warrantable, unimagined, unallowable, earthshaking, unprepared, unwelcome, myriad, determinable, unprecedented, consequential, predicable, cataclysmic, undeterminable, postnasal drip, certain, actual, minimal, impending, substantial, imponderable, consequent, regulatory, miscellaneous, immaterial, contributable, unscheduled, deferred, enormous, indeterminable, unpleasant, nonconformance, incidental, unsuspected, precipitious, epochal, severe, iatrogenic, maturational, unrecoverable, momentary, dramatic, frightful, nonrational, hemophilia b, nonoperational, unprovided, unintentional, unforseen, expectable, likely, predictable, detrimental

out of the blue, unexpected, unforeseen, unlooked-for