adventitious Synonyms

striking it rich serendipitous unforeseen incidental unlooked-for unexpected supplementary supplemental supervenient subsidiary subordinate unintentional unintended chancer on a streak into something getting a break everything going coming up roses from outside unanticipated unpredictable unplanned unpremeditated secondary random chance causeless casual auxiliary ancillary aleatory adscititious additional accidental accessory circumstantial coincidental contingent occasional nonessential inadvertent haphazard fortuitous foreign fluky extrinsic extraneous extra accessorial