Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Closely observant or alert; vigilant: kept a watchful eye on the clock. See Synonyms at aware, careful.
  • adj. Archaic Not sleeping; awake.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. observant, vigilant and aware

from the GNU version of the Collaborative International Dictionary of English

  • adj. Full of watch; vigilant; attentive; careful to observe closely; observant; cautious; -- with of before the thing to be regulated or guarded; ; and with against before the thing to be avoided.

from The Century Dictionary and Cyclopedia

  • Wakeful; sleepless.
  • Vigilant; careful; wary; cautious; observant; alert; on the watch: with of before the thing to be regulated or observed, and against before the thing to be avoided: as, to be watchful of one's behavior; to be watchful against the growth of vicious habits.
  • Synonyms Watchful, Vigilant, Wakeful, attentive, heedful, circumspect, guarded. Wakeful refers to the lack of disposition to sleep, especially at times when one would ordinarily have such a disposition; watchful and vigilant refer to the mind, will, or conduct: they are of about equal vigor; watchful is the broader in its range of meaning.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. engaged in or accustomed to close observation
  • adj. experiencing or accompanied by sleeplessness

Etymologies

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Examples

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