What is another word for "fortuitous"?

Roget's Thesaurus (1911) lists these synonyms for "fortuitous": accident, accidental, adscititious, adventitious, apparent, appearance, ascititious, contingent, ego, external, extraneous, extrinsic, extrinsical, extrinsicality, foreign, from, incidental, modal, non, nonessential, objective, objectiveness, outward, phenomenon, without.