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WordNet-Online
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Adjective wakeful has 2 senses
- argus-eyed, open-eyed, vigilant, wakeful, watchful - carefully observant or attentive; on the lookout for possible danger; "a policy of open-eyed awareness"; "the vigilant eye of the town watch"; "there was a watchful dignity in the room"; "a watchful parent with a toddler in tow"
Antonym: unalert (indirect, via alert)
- light, wakeful - (of sleep) easily disturbed; "in a light doze"; "a light sleeper"; "a restless wakeful night"
Antonym: deep (indirect, via shallow)
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