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on the alert
adjective as in unsleeping
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Synonym of the Day
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On this page you'll find 40 synonyms, antonyms, and words related to on the alert, such as: alive, astir, attentive, awake, careful, and heedful.
From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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