Synonyms and Antonyms of vigilant
- The night watchman, who was usually vigilant, apparently dozed off and didn't notice the vandals sneaking in.
on guard, on one's toes, on the alert, on the ball, on tiptoe
Synonym Discussion of vigilant
- the watchful eye of the department supervisor
- eternally vigilant in the safeguarding of democracy
- wide-awake companies latched onto the new technology
- alert traders anticipated the stock market's slide
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