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
When you study a dog you love, you find beauty in every small detail, and so it is with Lucille: I have become enchanted by the small asymmetrical whorls of white fur on either side of her chest, and by her tail, which she carries in a high confident curve, and by her eyes, which are watchful and intelligent, the color of chestnuts. Caroline Knapp