From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
57 Moby Thesaurus words for "unplanned": ad-lib, aimless, caught napping, caught off balance, caught short, designless, desultory, extemporaneous, extemporized, haphazard, hasty, hit-or-miss, impromptu, improvised, inadvertent, indiscriminate, involuntary, makeshift, precipitate, purposeless, rough-and-ready, snap, surprised, taken aback, taken by surprise, taken unawares, tripped up, unarranged, unbegun, unconcocted, unconscious, unconsidered, uncontrived, undeliberated, undesigned, undevised, unguarded, unguided, unhatched, unintended, unintentional, unmade, unmanufactured, unmeant, unmeditated, unorganized, unpremeditated, unprepared, unprimed, unprompted, unpurposed, unready, unstudied, unthinking, unthought, unthought-of, unwitting
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