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.

"People say that victims are gullible but the scams are put together well", they are very "sophisticated", said a source close to the investigation.

From Barron's • Jun. 5, 2026

We’ve been worrying about supersmart computers, but we should also worry about super-adorable computers manipulating gullible people.

From The Wall Street Journal • May 3, 2026

Professional and institutional investors turn positive on stocks at the beginning of a bull market, and gradually unload their appreciated equities to more gullible retail investors.

From MarketWatch • Mar. 25, 2026

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

From Los Angeles Times • Dec. 18, 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

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