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Synonyms for alert

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Watchful
wary, on guard, wide-awake; see observant 2.
Intelligent
bright, clever, quick, sharp; see intelligent 1, observant 1. See syn. study at intelligent, watchful.

noun

signal, alarm, warning; see alarm 1, warning.

on the alert

watchful, aware, vigilant, on guard; see observant 1, 2.

verb

inform, put on guard, warn, signal; see warn.

See alert in Webster's New World Roget's A-Z Thesaurus II

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