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Definition of watchful:

  1. 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.


on the watch, keen, open-eyed, argus-eyed, vigilant, nimble, lidless, wide-awake, insomniac, active, sleepless, rattling, zippy, prompt, brisk, awareness, lively, awake, spanking, merry, snappy, wakeful, hustling, alive, alert.

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