(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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). watchful. Retrieved September 24, 2026, from http://smartdefine.org/watchful/definitions/2080814 |
| Chicago | Webster's. 2011. "watchful" http://smartdefine.org/watchful/definitions/2080814 (accessed September 24, 2026). |
| Harvard | Webster's 2011, watchful, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/watchful/definitions/2080814>. |
| MLA | Webster's. "watchful" 28 May 2011. Web. 24 September 2026. <http://smartdefine.org/watchful/definitions/2080814> |