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Off one's guard; unprepared: a quiz that caught the class off-guard.
not expecting a surprise or danger that suddenly occurs
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|Adj.||1.||off-guard - not prepared or vigilant; "the blow caught him napping"; "caught in an off-guard moment"; "found him off his guard"|
unready - not prepared or in a state of readiness; slow to understand or respond; "she cursed her unready tongue"