Synonyms of on the alert

on the alert

phrase

as in alert

paying close attention usually for the purpose of anticipating approaching danger or opportunity

Residents were warned to stay on the alert for changes in the storm's projected path.

Synonyms & Similar Words

• alert
• awake
• on the ball
• vigilant
• watchful
• on the qui vive
• aware
• alive
• attentive
• careful
• on guard
• regardful
• cautious
• wide-awake
• sensitive
• on tiptoe
• wary
• observant
• Argus-eyed
• keen
• conscious
• open-eyed
• on one's toes
• tenty
• prepared
• mindful
• sharp
• cognizant
• hyperalert
• sleepless
• heedful
• wakeful
• ready
• hypervigilant
• chary
• sharp-eyed
• observing

Antonyms & Near Antonyms

• asleep
• preoccupied
• absent
• distracted
• dreaming
• absorbed
• engrossed
• oblivious
• unaware
• dreamy
• sleeping
• dazed
• unconscious
• abstracted
• insensible
• daydreaming
• faraway
• unwitting
• careless
• unprepared
• absentminded
• unmindful
• unwary
• unthinking
• heedless
• unknowing
• inattentive
• unheeding
• unready

Example Sentences

Recent Examples of on the alert

The area had been hunted by another party the previous week and the muskox were on the alert. — Ron Spomer, Outdoor Life, 19 Aug. 2026

London noir is a rare subgenre — and an especially difficult one to pull off — but Michele Fiascaris’ debut Rain Catcher is a satisfying, seductively atmospheric addition to the canon that will keep even the most jaded of viewers on the alert. — Damon Wise, Deadline, 6 July 2026