without notice

• suddenOccurring without prior notice
• unexpectedNot anticipated beforehand
• unannouncedWithout prior notice
• abruptSharp and unexpected
• surpriseUnexpected event causing astonishment

blindsided · ambush · out of the blue · warning · catch off guard · unprepared · shock · instant · immediate · terminated · eviction · fired · vanished · disappeared · ghosted · silent · overnight · snap