Dictionary and Thesaurus

Definition of Watchful

• (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.

Synonyms of Watchful

• Alert
• Insomniac
• Sleepless

Antonyms of Watchful

• Unalert

Homophones of Watchful