watchful

adjective

watch·​ful ˈwäch-fəl 

ˈwȯch-

1

archaic

a

: not able or accustomed to sleep or rest : wakeful

b

: causing sleeplessness

c

: spent in wakefulness : sleepless

2

: carefully observant or attentive : being on the watch

watchfully

ˈwäch-fə-lē 

ˈwȯch-

adverb

watchfulness noun

Synonyms of watchful

• alert
• vigilant
• awake
• careful

Choose the Right Synonym for watchful

watchful, vigilant, wide-awake, alert mean being on the lookout especially for danger or opportunity.

watchful is the least explicit term.

the watchful eye of the department supervisor

vigilant suggests intense, unremitting, wary watchfulness.

eternally vigilant in the safeguarding of democracy

wide-awake applies to watchfulness for opportunities and developments more often than dangers.

wide-awake companies latched onto the new technology

alert stresses readiness or promptness in meeting danger or in seizing opportunity.

alert traders anticipated the stock market's slide

Examples of watchful in a Sentence

We need to be more watchful of our children.

The hotel is being built under the watchful eye of its architect.

Recent Examples on the Web

During construction, the Feins purchased the house next door and lived there, keeping a watchful eye on the work. —Sara B. Hansen, Denver Post, 2 May 2026

Viktor Arvidsson, who was knocked woozy and out of the lineup on a high hit from the Sabres’ Mattias Samuelsson in Game 4, was skating under the watchful eye of skating and skills coach John McLean at Warrior Ice Arena on Friday morning. —Steve Conroy, Boston Herald, 1 May 2026

Powell, who plans to stay on the Fed as a member to keep a watchful eye, and his legal team will be watching the appeal carefully. —Matt Peterson, CNBC, 1 May 2026

In the song, an old-growth tree provides cover from the watchful eye of puritanical church folk; chili dogs and ice cream are an excuse to break free from parents. —Literary Hub, 29 Apr. 2026

Word History

First Known Use

15th century, in the meaning defined at sense 1a

Phrases Containing watchful

• keep a watchful eye on (someone or something)
• under the watchful/vigilant eye of

Kids Definition

watchful

adjective

watch·​ful ˈwäch-fəl 

ˈwȯch-

: continually on the lookout especially for danger

watchfully

-fə-lē 

adverb

watchfulness noun