1. (adj) argus-eyed, open-eyed, vigilant, wakeful
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"
2. (adj) light, wakeful
(of sleep) easily disturbed
"in a light doze"; "a light sleeper"; "a restless wakeful night"
3. (adj) waking, wakeful
marked by full consciousness or alertness
"worked every moment of my waking hours"
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Definition of 'wakeful' 
