Etymology
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wakeful (adj.)

c. 1400, "diligent," from wake (n.2) + -ful. Related: Wakefully; wakefulness.

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Definitions of wakeful

wakeful (adj.)
carefully observant or attentive; on the lookout for possible danger;
Synonyms: argus-eyed / open-eyed / vigilant
wakeful (adj.)
(of sleep) easily disturbed;
a restless wakeful night
Synonyms: light
wakeful (adj.)
marked by full consciousness or alertness;
Synonyms: waking
From wordnet.princeton.edu