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.

He capitalised fully, holing the subsequent 30-foot putt for an improbable birdie.

From BBC • Apr. 18, 2026

Though it is all improbable, the parts do mesh neatly; they make television sense.

From Los Angeles Times • Apr. 15, 2026

“Meme” traders had a hand in the improbable three-year septupling of bitcoin.

From The Wall Street Journal • Apr. 3, 2026

For decades, closure of the strait was regarded as something that was conceivable in theory, but operationally improbable in practice, Morgan Stanley noted.

From Barron's • Mar. 24, 2026

So Allen came up with a secret, highly improbable strategy for getting through Vietnam.

From "Boots on the Ground: America's War in Vietnam" by Elizabeth Partridge

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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