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Adjective: watchful  wóch-ful
  1. Without or unable to sleep
    "twenty watchful, weary, tedious nights";
    - insomniac, sleepless
  2. Carefully observant or attentive; on the lookout for possible danger
    "there was a watchful dignity in the room"; "a watchful parent with a toddler in tow";
    - argus-eyed, open-eyed, vigilant, wakeful
  3. Engaged in or accustomed to close observation
    "caught by a couple of watchful cops";
    - alert

See also: awake, fly [Brit, informal], heads-up, lidless, lively, sleepless, wary, wide-awake

Antonym: unvigilant

Encyclopedia: Watchful