Synonyms of 'insupportable'
Life without her was tedious, insupportable.
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If you say that a statement, action, or idea is indefensible, you mean that it cannot be justified or supported because it is completely wrong or unacceptable.
She described their actions as `morally indefensible'.
If you say that someone or something is insufferable, you are emphasizing that they are very unpleasant or annoying.
We all agreed he was the most insufferable bore.
If you describe something as intolerable, you mean that it is so bad or extreme that no one can bear it or tolerate it.
They felt this would place intolerable pressure on them.
Thesaurus for insupportable from the Collins English Thesaurus
If you say that something is insupportable , you mean that it cannot be coped with or accepted.