Unforeseen+occasion
131chance — Synonyms and related words: a leg up, accidental, accidentally, advantage, adventitious, adventure, aleatoric, aleatory, amorphous, appear, approach, aptitude, aptness, arise, assay, attempt, bare possibility, bechance, befall, bet, betide, blind …
132accident — I (New American Roget s College Thesaurus) n. mishap, injury, casualty; chance, fortuity. See adversity, occurrence. Ant., plan, design. II (Roget s IV) n. 1. [An unexpected misfortune] Syn. mishap, mischance, setback, collision; see collision 1 …
