Ranked by relevance and common usage.
Keep "insupportable" when the sentence already sounds natural, when a synonym would add unintended emphasis, or when readers need the most familiar wording. A synonym should clarify or sharpen the message, not simply make the sentence look more varied.
If two options seem close, choose the one that best matches the audience and purpose of the sentence.
Choose a synonym only if it keeps the core idea of "insupportable" intact in the sentence you are editing.
Check whether the replacement sounds more formal, casual, emotional, technical, or forceful than the original word.
Read the full sentence after the swap. Keep the synonym only when the sentence becomes clearer or more precise.
Review note: Synonym lists are ranked with lexical data and reviewed for practical writing value. Use the comparison notes, sentence evidence, and source labels together; a high-ranking synonym can still be wrong when the audience, register, or grammar changes.
After choosing a replacement for "insupportable", read the sentence once for meaning and once for rhythm. The best synonym should feel natural in the full sentence, not only accurate in a word list.
If the synonym makes the sentence slower, vaguer, or more dramatic than intended, keep "insupportable" or choose a simpler alternative from the closest-match group.
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9 total sentences available.
I dwell the longer upon this Subject from the Desire I have to make the Society of an English Yahoo by any Means not insupportable; and therefore I intreat those who have any Tincture of this absurd Vice, that they will not presume to appear in my Sight.
Source: tatoeba (4613269)
My Lord you do me moſt inſupportable vexation.
Source: wiktionary
The Captain, at Mr. Allworthy’s Inſtance, was outwardly, as we have ſaid, reconciled to his Brother, yet the ſame Rancour remained in his Heart; and he found ſo many Opportunities of giving him private Hints of this, that the Houſe at laſt grew inſupportable to the poor Doctor; and he choſe rather to ſubmit to any Inconveniencies which he might encounter in the World, than longer to bear theſe cruel and ungrateful Inſults, from a Brother for whom he had done ſo much.
Source: wiktionary
“Come, Darcy,” said he, “I must have you dance. I hate to see you standing about by yourself in this stupid manner. You had much better dance.” ¶ “I certainly shall not. You know how I detest it, unless I am particularly acquainted with my partner. At such an assembly as this, it would be insupportable. Your sisters are engaged, and there is not another woman in the room, whom it would not be a punishment to me to stand up with.”
Source: wiktionary
Showing 4 of 9 available sentences.
Closest matches include indefensible, unjustifiable, heavy, insufferable, intolerable.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.