| alert | (adjective) engaged in or accustomed to close observation | Synonyms: watchful |
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| (adjective) mentally perceptive and responsive | Synonyms: alive, awake |
| (adjective) quick and energetic | Synonyms: brisk, lively, merry, rattling, snappy, spanking, zippy |
| (noun) a warning serves to make you more alert to danger | Synonyms: alerting |
| (noun) an automatic signal (usually a sound) warning of danger | Synonyms: alarm, alarum, warning signal |
| (noun) condition of heightened watchfulness or preparation for action | Synonyms: qui vive |
| (verb) warn or arouse to a sense of danger or call to a state of preparedness | Synonyms: alarm |
| unalert | (adjective) not alert to what is potentially dangerous | Synonyms: unvigilant, unwatchful |
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