insupportable
in-sup-port-a-ble
adjective
Too severe or difficult to be endured; utterly unbearable.
"The insupportable heat made working impossible."
adjective
Incapable of being justified, defended, or maintained as valid.
"His insupportable claims lacked any evidence."
Thesaurus
Synonyms: unwarranted, unjustifiable, indefensible, unwarrantable, inexcusable