unwary
[adjective]
Synonyms: incautious, unalert, unguarded, unvigilant, unwatchful, credulous, unsuspecting, unsuspicious, rash, brash, hasty, hotheaded, ill-advised, inconsiderate, reckless, thoughtless, unadvised

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Antonyms: wary

[TahlilGaran] English Synonym Dictionary ▲

un‧wa‧ry /ʌnˈweəri $ -ˈweri/ adjective formal

1. not knowing about possible problems or dangers, and therefore easily harmed or deceived:
unwary travellers

2. the unwary [plural] people who are unwary:
pitfalls that can trap the unwary

[TahlilGaran] Dictionary of Contemporary English ▲