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on the qui vive
adjective as in alert
Strongest matches
adjective as in attentive
adjective as in open-eyed
adjective as in uneasy
Strongest matches
adjective as in unsleeping
adjective as in vigilant
adjective as in wakeful
adjective as in wary
Strongest matches
adjective as in watchful
Strong match
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From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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