improbable

[im-prob-uh-buhl] / ɪmˈprɒb ə bəl /

ADJECTIVE

not likely

Synonyms

STRONGEST

fanciful implausible rare unbelievable unlikely

WEAK

doubtful dubious far-fetched flimsy hundred-to-one iffy inconceivable not expected outside chance questionable slim slim and none uncertain unconvincing unheard of unimaginable unsubstantial weak

Antonyms

STRONGEST

believable likely ordinary plausible probably real

WEAK

ostensible possible probable tenable

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.

Then came the most improbable comeback in college basketball’s modern history.

From The Wall Street Journal • Mar. 30, 2026

And those were the images that returned with his improbable fifth Masters victory in 2019, fused back and all, achieved at the age of 43.

From BBC • Mar. 28, 2026

Before long, however, the two improbable friends have formed a siblinglike bond, sharing toys and teasing each other over who gets the most praise from Basma.

From The Wall Street Journal • Mar. 20, 2026

At least that’s what one improbable image fantasized in a recent slew of AI-generated “wedding photos” circulating online.

From Los Angeles Times • Mar. 17, 2026

Chicken John was forever losing the trail and ending up in the most improbable places.

From "A Walk in the Woods" by Bill Bryson

Vocabulary lists containing improbable

"To Kill a Mockingbird" by Harper Lee, Chapters 20–25

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"A Quilt of a Country," Vocabulary from the argument

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"A Quilt of a Country" by Anna Quindlen

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