Webster's English Dictionary

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watchful

watch.ful \'wa:ch-f*l\ \-f*-le-\ aj archaic  1a: WAKEFUL  1b: causing 
   sleeplessness  1c: SLEEPLESS  2: marked by vigilance : VIGILANT, ATTENTIVE 
   eing on the lookout esp. for danger or opportunity. WATCHFUL is the least 
   explicit term; VIGILANT suggests keen, unremitting, wary watchfulness; 
   WIDE-AWAKE applies to watchfulness for opportunities more often than 
   dangers and suggests awareness of relevant developments and situations; 
   ALERT stresses readiness or promptness in apprehending and meeting danger 
   or emergency or in seizing opportunity - watch.ful.ly av SYN syn WATCHFUL, 
   VIGILANT, WIDE-AWAKE, ALERT mean b