/ Dictionary / Index W watchful: Meaning and Definition of Find definitions for: watch•ful Pronunciation: (woch'ful), [key] — adj. vigilant or alert; closely observant: The sentry remained watchful throughout the night. wakeful. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: watchful (Thesaurus) watch fire watch guard Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language