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.
Unless you become more watchful in your states and check the spirit of monopoly and thirst for exclusive privileges you will in the end find that... the control over your dearest interests has passed into the hands of these corporations. Andrew Jackson
There are times when fear is good. It must keep its watchful place at the heart's controls. Aeschylus
But the watchful care of the parent is endless. The youth is never free from the danger of grating interference. William Godwin
There would be no idling in a co-operative workshop. Each workman, being an employer, has a spur to his own industry, and has a pecuniary reason for being watchful of the industry of his fellow workmen. Leland Stanford
More firm and sure the hand of courage strikes, when it obeys the watchful eye of caution. James Thomson