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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. . Happy watchful shepherds. . 'Twixt prayer and watchful love his heart dividing. (Keble)

Synonym: Vigilant, attentive, cautious, observant, circumspect, wakeful, heedful.

Watchfully, Watchfulness.