unvigilant

Adjective

Meaning

not alert to what is potentially dangerous

Source: WordNet

Synonyms

unwatchful unalert indiscreet bold asleep careless reckless negligent inadvertent inattentive unready unthinking heedless inconsiderate incautious
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Antonyms

old responsible formal practical proper conservative
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Close letter words and terms

unviewable unviewed unvigilance unvigorous unvigorously unvilified