What is another word for impossible?

Need synonyms for impossible? Here's a list of similar words from our thesaurus that you can use instead.

Adjective
Not able to occur or to be achieved
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“Attempting to levitate the X-Wing out of the bog proved to be an impossible task for Luke.”
Adjective
Very difficult to deal with
“It's impossible to live in this apartment without air-conditioning during the hot summer.”
Adjective
(informal, of a person) Having an unreasonable disposition or character
“What an utterly arrogant and impossible oaf he has turned out to be.”
Adjective
Not likely to be true or to happen
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Adjective
Idealistic or romantic in one's perception of something, at times overly so
Adjective
Lacking sense or sound reasoning
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Adjective
Not negotiable
Adjective
Having self-contradictory properties
Adjective
Contrary to reason or common sense
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Adjective
Resistant to control or authority
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Adjective
Used to emphasize the extent of something unpleasant or bad
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Adjective
Requiring more effort than could be reasonably expected or asked for
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Adjective
Beyond all hope
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Adjective
Impossible or difficult to pronounce or articulate
Adjective
Very difficult to deal with or use
Adjective
(of a person or their behaviour) Not able to be changed or reformed
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Adjective
That has been described as greater or better than it actually is
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Adjective
Restrictive; beyond one's
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Adjective
Causing or tending to cause annoyance, frustration, or worry
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Adjective
Causing embarrassment or unease
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Adjective
Hateful
Adjective
Ambitious or difficult to achieve
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Noun
No chance
“Thomas Young lived in a pivotal time. The explosion of knowledge that was soon to come made it impossible to be a true polyhistor.”
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