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Discover LudwigThe word "unsufferable" is not correct in written English.
It is not an accepted form of the word "intolerable". You can use the word "intolerable" in written English, to describe something unbearable. Example sentence: The summer heat was becoming intolerable, so I decided to book an air-conditioned hotel room.
Dictionary
unsufferable
adjective
Not able to be suffered, difficult or impossible to endure; insufferable.
Exact(2)
He became Leopold I and grumbled constantly about his fractious subjects, whom he derided as "unsufferable creatures".
In a letter written in July 1797, Evans described quite amazing woes: "Now lost in the infinite wilderness of America – Oh unsufferable Thirst and hunger is an amusement in comparison to this … 3rd day here my fever returned … Travelled several miles in water from the hip to the Arm Pitt, amongst a numerous crowd of the biggest water reptiles I ever saw".
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com