Thesaurus

vigilant

adjective

Synonyms and Antonyms of VIGILANT

paying close attention usually for the purpose of anticipating approaching danger or opportunity <the night watchman, who was usually vigilant, apparently dozed off and didn't notice the vandals sneaking in>
Antonyms asleep

Browse

How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears