Synonyms of vigilant in English:

vigilant


See US English definition of vigilant

See UK English definition of vigilant

See Spanish definition of alerta

adjective

1‘there had been a rash of petty thefts and we were warned to be vigilant’

SYNONYMS
watchful, on the lookout, observant, sharp-eyed, keen-eyed, gimlet-eyed, eagle-eyed, hawk-eyed, with eyes like a hawk, with one's eyes open, keeping one's eyes peeled, keeping one's eyes skinned, attentive, paying attention, alert, on the alert, on one's toes, on the qui vive
awake, wide awake, unsleeping, on one's guard, on guard, concentrating, careful, cautious, wary, chary, circumspect, prudent, heedful, mindful
prepared, ready
informal beady-eyed, not missing a trick, on the ball, keeping a weather eye on things, leery
rare regardful, Argus-eyed
ANTONYMS

negligent, inattentive