off guard Synonyms

napping off her guard off his guard off one's guard off your guard unready unwary unalert off guard asleep by surprise unprepared unguarded unsuspecting unvigilant unwatchful not prepared unawares unaware careless derelict distracted flat-footed inadvertent inattentive incautious lost neglectful negligent oblivious reckless remiss surprised thoughtless with one's defences down