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Definitions

gullible

[guhl-uh-buhl] / ˈgʌl ə bəl /
ADJECTIVE
naive, trusting
Synonyms
STRONGEST
foolish unsophisticated unsuspecting wide-eyed
WEAK
being a sucker believing biting credulous easily taken in easy mark falling hook line and sinker green innocent kidding oneself mark silly simple sucker susceptible swallowing whole taken in taking the bait trustful tumbling for unskeptical
Antonyms
WEAK
astute discerning knowledgeable perceptive suspicious unbelieving untrusting wise

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Or is it more like Freddy Krueger, coming back to haunt the gullible?

From The Wall Street Journal • Mar. 22, 2026

And the message-board-born concept of a “lolcow,” a gullible user who can be goaded into making a fool of themselves on a regular basis, definitely predated the music video.

From Salon • Feb. 16, 2026

The fundamental problem is that hopeful investors are too often gullible investors.

From MarketWatch • Feb. 6, 2026

Maybe I would have too — I’m really gullible.

From Los Angeles Times • Dec. 18, 2025

In reality, the United States wasn’t as gullible as it had been portrayed.

From "Spooked!" by Gail Jarrow

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.