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From 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]