What is another word for impossible?

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

Not able to occur or to be achieved
“Attempting to levitate the X-Wing out of the bog proved to be an impossible task for Luke.”
Very difficult to deal with
“It's impossible to live in this apartment without air-conditioning during the hot summer.”
(informal, of a person) Having an unreasonable disposition or character
“What an utterly arrogant and impossible oaf he has turned out to be.”
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