An unexpected misfortune
mishap, mischance, setback, collision; see collision 1, disaster, misfortune 2.
Chance, or a chance happening
fortune, chance, luck, adventure, contingency, occurrence, happening, circumstance, turn, unforeseen occurrence, fortuity,
event, occasion, befalling, fluke*; see also chance 1.
An unexpected and usually undesirable event:
An unexpected random event:
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