Synonyms of alert in English:

alert


See US English definition of alert

See UK English definition of alert

See Spanish definition of alerta

adjective

1‘police have asked neighbours to be alert after a spate of burglaries in the area’

SYNONYMS
vigilant, hypervigilant, wide awake, aware, watchful, attentive, observant, circumspect, wary, chary, heedful, canny
on the lookout, on one's guard, on one's toes, all ears, keeping one's eyes open, keeping one's eyes peeled, keeping a weather eye open, on the qui vive
ANTONYMS

inattentive

2‘she continued to paint in old age in order to remain mentally alert’

SYNONYMS
quick-witted, sharp, bright, quick, keen, perceptive, wide awake, responsive, agile, acute, astute
informal on the ball, on one's toes, quick off the mark, quick on the uptake, all there, with it, bright-eyed and bushy-tailed
ANTONYMS

slow


noun

1‘the army called for a state of alert’

SYNONYMS
vigilance, watchfulness, carefulness, attentiveness, guardedness, care, caution, cautiousness, wariness, chariness, alertness, hypervigilance, circumspection, prudence, heedfulness, heed, mindfulness
ANTONYMS

carelessness

2‘a flood alert has been issued’

SYNONYMS
warning, caution, notification, notice, exhortation, injunction
siren, alarm, signal, danger signal, distress signal

verb

1‘police were alerted by a phone call from the house’

SYNONYMS
warn, notify, apprise, caution, put on one's guard, forewarn, put on the qui vive, arouse
informal tip off, clue in, put in the picture, put wise