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

Along the way, Michael develops an unlikely friendship with Kacey (Lauren Patel), while navigating the demands of his boss Gordon (Crook) and the watchful eyes of nosy neighbours Bev (Sophie Willan) and Clive (Jon Pointing). — Jake Kanter, Deadline, 8 Sep. 2026

South of Valencia along the Costa Blanca is Alicante, a walkable port city and an outdoor lover’s paradise with parks, gardens, and historic plazas unfold beneath the watchful eye of a 9th-century castle. — Condé Nast Traveler, 3 Sep. 2026

In fact, active surveillance, also known as watchful waiting, is a very rigorous program to monitor the cancer, but sometimes patients have a hard time. — Fran Kritz, Verywell Health, 1 Sep. 2026

Located at the very north end of Napa Valley, the winery has changed hands a few times but today it is owned by Jackson Family Wines and is under the watchful eye of Barbara Banke and her children. — Mike Desimone, Robb Report, 28 Aug. 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