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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.

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

From MarketWatch • Feb. 6, 2026

Our grandparents weren’t gullible; they encountered threats they didn’t recognize.

From The Wall Street Journal • Feb. 3, 2026

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

From Los Angeles Times • Dec. 18, 2025

Ms Slinn added: "You just feel a bit stupid, don't you? You think 'how gullible can you be to give £5,000 to people you don't even know who they are?'."

From BBC • Apr. 3, 2025

I can hardly believe he is so gullible that the sailors are able to fool him like this.

From "Blood on the River" by Elisa Carbone

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