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30 entries under keen topic. ×

1
aware(alert, careful, attentive, watchful)
1
cautious(alert, careful, attentive, watchful)
1
circumspect(alert, careful, attentive, watchful)
1
guarded(anxious, alert, careful, cautious)
1
looking for(expression, anxious, alert, careful)
1
looking to(expression, anxious, alert, careful)
1
observant(alert, careful, attentive, watchful)
1
on guard(expression, anxious, alert, careful)
1
on the ball(expression, alert, careful, attentive)
1
on the job(expression, idiom, alert, careful)
1
on the lookout(expression, idiom, alert, careful)
1
on the qui vive(expression, idiom, alert, careful)
1
on toes(expression, anxious, alert, careful)
1
open-eyed(anxious, alert, careful, cautious)
1
sharp(anxious, alert, careful, attentive)
1
sleepless(anxious, alert, careful, cautious)
1
unsleeping(anxious, alert, careful, cautious)
1
waiting on(expression, anxious, alert, careful)
1
wakeful(anxious, alert, careful, cautious)
1
wary(alert, careful, attentive, watchful)
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APASmart Define. (2011). on alert thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/on_alert/thesaurus/synonyms
ChicagoSmart Define. 2011. "on alert thesaurus" https://smartdefine.org/on_alert/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2011, on alert thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/on_alert/thesaurus/synonyms>.
MLASmart Define. "on alert thesaurus" 24 May 2011. Web. 29 September 2026. <https://smartdefine.org/on_alert/thesaurus/synonyms>