Synonyms|231Antonyms|67|Broader|2Narrower|0Related|250

30 entries under keen topic. ×

9
alert(adjective, careful, restless, disturbed)
9
wakeful(adjective, anxious, alert, careful)
9
watchful(adjective, alert, careful, restless)
6
unsleeping(adjective, anxious, careful, restless)
5
wide-awake(adjective, anxious, alert, careful)
4
attentive(adjective, alert, careful, restless)
4
wary(adjective, alert, careful, restless)
3
observant(adjective, alert, careful, restless)
2
anxious(adjective, alert, careful, unsettled)
2
cautious(adjective, alert, careful, attentive)
2
guarded(anxious, alert, careful, cautious)
2
on guard(expression, anxious, alert, careful)
2
on the ball(expression, idiom, alert, careful)
2
on the job(expression, idiom, alert, careful)
2
on the lookout(expression, idiom, alert, careful)
2
open-eyed(anxious, alert, careful, cautious)
2
sharp(anxious, alert, careful, attentive)
1
acute(anxious, alert, careful, cautious)
1
agog(anxious, alert, careful, cautious)
1
aware(alert, careful, attentive, watchful)
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APASmart Define. (2015). sleepless thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/sleepless/thesaurus/synonyms
ChicagoSmart Define. 2015. "sleepless thesaurus" https://smartdefine.org/sleepless/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, sleepless thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/sleepless/thesaurus/synonyms>.
MLASmart Define. "sleepless thesaurus" 14 April 2015. Web. 27 September 2026. <https://smartdefine.org/sleepless/thesaurus/synonyms>