watchful

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}]
    

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]
    

74 Moby Thesaurus words for "watchful":
      Argus-eyed, advertent, agog, alert, all ears, all eyes, assiduous,
      attentive, aux aguets, aware, careful, cautious, chary,
      circumspect, concentrated, conscious, covering, custodial,
      defensive, diligent, eagle-eyed, earnest, finical, finicking,
      finicky, fostering, guarded, guardian, guarding, hawk-eyed,
      heedful, immunizing, intense, intent, intentive, keen-eyed,
      lidless, meticulous, mindful, nice, niggling, observant, observing,
      on guard, on the ball, on the job, on the lookout, on the watch,
      open-eared, open-eyed, openmouthed, parental, preventive, prompt,
      prophylactic, protecting, protective, prudent, quick, ready,
      regardful, safeguarding, screening, sharp-eyed, sheltering,
      shielding, sleepless, tutelary, unsleeping, vigilant, wakeful,
      wary, wide-awake, with open eyes