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alert has 15 distinct synonyms spread across 7 of its 7 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is unalert.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
condition of heightened watchfulness or preparation for action
“bombers were put on alert during the crisis”
a warning serves to make you more alert to danger
an automatic signal (usually a sound) warning of danger
Synonyms, antonyms and the broader and narrower relations for alert come from Princeton University’s WordNet. Full sources and licences.