off-guard
AdjectiveWordNet 3.0
Adjective (1)
- not prepared or vigilant“the blow caught him napping”“caught in an off-guard moment”“found him off his guard”Synonyms: nappingoff guardoff one's guardoff his guardoff her guardoff your guard
Webster's Dictionary (GCIDE)
off-guard \off-guard\ pred. adj. not watching for possible danger; not alert; as, caught in an off-guard moment. [WordNet 1.5]