UNGUARDED

adj. 1 incautious, unwary, careless, inattentive, heedless, inobservant, inadvertent, unthinking, unwatchful, unvigilant He let the intruder past him in an unguarded moment 2 defenceless, unprotected, undefended, unfortified, open, uncovered, exposed, vulnerable The sentry insisted that he had left his post unguarded for only a few minutes 3 indiscreet, careless, imprudent, unwise, hasty, unthinking, thoughtless; guileless, incautious He was anxious to restore good relations after his unguarded remarks about their associates