- intolerable; unbearable; unendurable
- incapable of being upheld, proved, etc.: insupportable charges
Origin of insupportableEcclesiastical Late Latin insupportabilis
- Not endurable; intolerable: insupportable mental anguish.
- Lacking grounds or defense; unjustifiable: an insupportable claim.
(comparative more insupportable, superlative most insupportable)
From Middle French insupportable, from Late Latin insupportabilis. See also in- + supportable