| Fortuitous 1. (a.) Happening by chance or fortunately; occurring as an unexpected surprise; as, a fortuitous bounce of a football. 2. (a.) Happening independently of human will or means of foresight; resulting from unavoidable physical causes. Thesaurus Entries accessory, accidental, additional, adscititious, adventitious, aleatory, appurtenant, ascititious, auxiliary, casual, causeless, chance, chancy, circumstantial, collateral, contingent, destinal, dicey, extra, fatal, fatidic, fluky, iffy, incidental, indeterminate, inessential, nonessential, odd, risky, secondary, subsidiary, superadded, superfluous, supervenient, supplemental, supplementary, uncaused, undetermined, unessential, unexpected, unforeseeable, unforeseen, unlooked-for, unpredictable |