Synonyms of vigilant

1 Syllable

prompt, keen, sharp, glued

2 Syllables

jealous, sophic, alert, knowing, nimbler, conscious, cautious, watchful, agog, mindful, watched, sharp-eyed, prudent, prompter, discreet, wary, guarded, nimblest, anxious, enrapt, sleepless, warier, with-it

3 Syllables

unsleeping, custodial, tuned-in, wakeful, awake, observant, paternal, provident, percipient, awaking, judgmatic, expectant, surveillant, advertent, alerting, careful, awaked, acute, open-eyed, insomniac, circumspect, aware

4 Syllables

forethoughtful, undistracted, overcautious, possessory, well-prepared, unwasteful, patrilineal, wide-awake, intentive, attentive, protective, undivided

5 Syllables

supraliminal, conservational, observative

6 Syllables

overprotective