say it: in-suh-PAWR-tuh-buhl
insupportable is an adjective meaning "incapable of being justified or explained". It carries one recorded sense.
incapable of being justified or explained
Definitions, synonyms and semantic relations for insupportable come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.