Synonyms of 'insupportable'
impossible to tolerate◾Life without her was tedious, insupportable.
incapable of being upheld or justified◾This is an increasingly insupportable argument in these times.
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(of behaviour or statements) unable to be justified or supported
She described their actions as `morally indefensible'.
We all agreed he was the most insufferable bore.
Thesaurus for insupportable from the Collins English Thesaurus