Synonyms of 'adventitious'

accessory, accidental, additional, adscititious, aleatory, appurtenant, auxiliary, casual, chance, chancy, circumstantial, collateral, conditional, contingent, dicey, extra, fatal, fatidic, fluky, fortuitous, iffy, incidental, indeterminate, inessential, nonessential, occasional, provisional, risky, secondary, subsidiary, superfluous, supervenient, supplemental, supplementary, uncaused, undetermined, unessential, unexpected, unforeseeable, unforeseen, unlooked-for, unpredictable