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Wordnet 3.0

ADJECTIVE (2)

1. engaged in or accustomed to close observation;
- Example: "caught by a couple of alert cops"
- Example: "alert enough to spot the opportunity when it came"
- Example: "constantly alert and vigilant, like a sentinel on duty"
[syn: alert, watchful]

2. experiencing or accompanied by sleeplessness;
- Example: "insomniac old people"
- Example: "insomniac nights"
- Example: "lay sleepless all night"
- Example: "twenty watchful, weary, tedious nights"- Shakespeare
[syn: insomniac, sleepless, watchful]



The Collaborative International Dictionary of English v.0.48:

Watchful \Watch"ful\, a.
   Full of watch; vigilant; attentive; careful to observe
   closely; observant; cautious; -- with of before the thing to
   be regulated or guarded; as, to be watchful of one's
   behavior; and with against before the thing to be avoided;
   as, to be watchful against the growth of vicious habits.
   "Many a watchful night." --Shak. "Happy watchful shepherds."
   --Milton.
   [1913 Webster]

         'Twixt prayer and watchful love his heart dividing.
                                                  --Keble.
   [1913 Webster]

   Syn: Vigilant; attentive; cautious; observant; circumspect;
        wakeful; heedful.
        [1913 Webster] -- Watch"ful*ly, adv. --
        Watch"ful*ness, n.
        [1913 Webster]


WordNet (r) 3.0 (2006):

watchful
    adj 1: engaged in or accustomed to close observation; "caught by
           a couple of alert cops"; "alert enough to spot the
           opportunity when it came"; "constantly alert and
           vigilant, like a sentinel on duty" [syn: alert,
           watchful] [ant: unalert, unvigilant, unwatchful]
    2: experiencing or accompanied by sleeplessness; "insomniac old
       people"; "insomniac nights"; "lay sleepless all night";
       "twenty watchful, weary, tedious nights"- Shakespeare [syn:
       insomniac, sleepless, watchful]