Synonyms|20Antonyms|13|Broader|0Narrower|0Related|15
6
sleepless
5
watchful
4
vigilant
3
alert
1
all ears
1
custodial
1
guarded
1
hawk-eyed
1
insomniac
1
observant
1
on guard
1
on the lookout(expression, idiom)
1
open-eyed
1
prudent
1
sharp-eyed
1
topless
1
wakeful
1
wary
0
restless
0
unlidded
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APASmart Define. (2015). lidless thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/lidless/thesaurus/synonyms
ChicagoSmart Define. 2015. "lidless thesaurus" https://smartdefine.org/lidless/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, lidless thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/lidless/thesaurus/synonyms>.
MLASmart Define. "lidless thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/lidless/thesaurus/synonyms>