Synonyms|139Antonyms|1|Broader|0Narrower|0Related|22
3
observant(adjective, keen, alert, careful, cautious)
3
open-eyed(adjective, keen, anxious, alert, careful)
3
persevering
3
plodding
3
restless
3
sedulous
3
unrelenting
3
unswerving(adjective, perseverance)
3
unwavering(adjective, perseverance)
3
wary(adjective, keen, alert, careful, cautious)
2
agile
2
careful(adjective, keen, alert, cautious, attentive)
2
keen(adjective, anxious, alert, careful, cautious)
2
on the ball(expression, adjective, idiom, keen, alert)
2
on the job(expression, adjective, idiom, keen, anxious)
2
quick
2
ready(adjective, alert, careful, cautious, attentive)
2
resolute
2
sharp(keen, anxious, alert, careful, attentive)
2
tireless
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APASmart Define. (2015). unsleeping thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unsleeping/thesaurus/synonyms
ChicagoSmart Define. 2015. "unsleeping thesaurus" https://smartdefine.org/unsleeping/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, unsleeping thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unsleeping/thesaurus/synonyms>.
MLASmart Define. "unsleeping thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/unsleeping/thesaurus/synonyms>