accidental Synonyms

incidental fortuitous inadvertent serendipitous occasional contingent casual adventitious coincidental unpremeditated unintended unintentional nonessential unforeseen involuntary unplanned unexpected unanticipated chance happenstance by chance unessential unmeant incidentally adventitial undreamt supervenient revelatory unimportant supplementary unwilled undirected unwitting uncaused unlooked-for unlooked tangential unforeseeable undreamed localised uncalculated unheralded unimagined unpredicted unthought not bargained for not planned not deliberate randomize unpredictable