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Definitions

impossible

[im-pos-uh-buhl] / ɪmˈpɒs ə bəl /
ADJECTIVE
beyond the bounds of possibility
Synonyms
STRONGEST
absurd futile hopeless impassable impractical inaccessible inconceivable insurmountable preposterous unattainable unimaginable unreasonable unthinkable unworkable useless
STRONG
visionary
WEAK
beyond contrary to reason cureless hardly possible hundred-to-one impervious impracticable inexecutable infeasible irrealizable irreparable no-go no-win not a prayer out of the question too much unachievable uncorrectable unfeasible unobtainable unrecoverable way-out
Antonyms
STRONGEST
believable conceivable hopeful imaginable logical practical reasonable sensible
WEAK
achievable obtainable possible
ADJECTIVE
intolerable, ungovernable
Synonyms
STRONGEST
absurd hopeless ludicrous outrageous preposterous unacceptable unreasonable
STRONG
offensive undesirable
WEAK
egregious improper incongruous objectionable unanswerable unsuitable
Antonyms
STRONGEST
acceptable
STRONG
pleasing
WEAK
achievable believable governable manageable tenable tolerable

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.

While he has talked a big game about adding potentially another five seats, that may just be impossible.

From Slate • Apr. 22, 2026

Searching such a ship at sea would likely be impossible, with potentially thousands of containers to sort through.

From The Wall Street Journal • Apr. 20, 2026

"I remember a few people said that the place where Proxima is today was impossible," says Francesco Sciortino, the co-founder and CEO of Proxima Fusion.

From BBC • Apr. 20, 2026

Being accused of attempting the impossible is not unusual for the scientists and engineers working on nuclear fusion projects around the world.

From BBC • Apr. 20, 2026

Father didn’t like the attention: “It has caused a great deal of trouble and anxiety … it is impossible for us to attend to our daily occupations.”

From "American Spirits" by Barb Rosenstock

Vocabulary lists containing impossible

List 1

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myPerspectives 7.3

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