Synonyms: unguarded
Definition: displaying or feeling no wariness
Usage: an unguarded remark
Similar words: unwary
Definition: not alert to danger or deception
Usage: the shrieks of unwary animals taken by surprise; some thieves prey especially on unwary travelers; seduce the unwary reader into easy acquiescence- O.J.Campbell
Synonyms: unguarded
Definition: lacking protection or a guard
Usage: an unguarded gate; his unguarded queen was open to attack