Impossible definition

ĭm-pŏsə-bəl
Not capable of being done easily or conveniently.
adjective
8
1
Not capable of being endured, used, agreed to, etc. because disagreeable or unsuitable.

An impossible task, an impossible request.

adjective
4
2
The definition of impossible is something that cannot be done, that cannot be true, or it also is something or someone who is hard to deal with.

Walking to the moon is an example of something that would be described as impossible.

Someone who is really demanding, and who is never pleased no matter what, is an example of someone who would be described as impossible.

adjective
0
0
Not possible, not able to be done.

It is difficult, if not impossible, to memorize 20,000 consecutive numbers.

adjective
0
0
(colloquial, of a person) Very difficult to deal with.

You never listen to a word I say – you're impossible!

adjective
0
0
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(mathematics, dated) Imaginary.

Impossible quantities, or imaginary numbers.

adjective
0
0
noun
0
0
(uncountable) (with definite article) That which seems impossible.

If we work together, we can achieve the impossible!

noun
0
0
Not capable of being accomplished.

An impossible goal.

adjective
2
3
Incapable of having existence or of occurring.
adjective
1
2
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Unacceptable; intolerable.

Impossible behavior.

adjective
1
2
Extremely difficult to deal with or tolerate.

An impossible child; an impossible situation.

adjective
1
2
Not capable of being, being done, or happening.
adjective
0
2

Other Word Forms

Noun

Singular:
impossible
Plural:
impossibles

Origin of impossible

  • Middle English from Old French from Latin impossibilis in- not in–1 possibilis possible possible

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Old French impossible, from Latin impossibilis, from in- (“not”) + possibilis (“possible”), from possum (“to be able”) + suffix -ibilis (“-able”).

    From Wiktionary