1. wakeful

adjective. Carefully observant or attentive; on the lookout for possible danger.
Synonyms
vigilant watchful alert argus-eyed open-eyed
Antonyms
unalert dull unwary lethargic unaware
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2. wakeful

adjective. (of sleep) easily disturbed.
Synonyms
light shallow
Antonyms
deep fall asleep wake

3. wakeful

adjective. Marked by full consciousness or alertness.
Synonyms
awake waking
Antonyms
asleep blind unconscious
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