'Watchful' definitions:

Definition of 'watchful'

From: WordNet
adjective
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]
adjective
Experiencing or accompanied by sleeplessness; "insomniac old people"; "insomniac nights"; "lay sleepless all night"; "twenty watchful, weary, tedious nights"- Shakespeare [syn: insomniac, sleepless, watchful]

Definition of 'Watchful'

From: GCIDE
  • 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]