The Collaborative International Dictionary
Insupportableness
Insupportable \In`sup*port"a*ble\, a. [L. insupportabilis: cf. F. insupportable. See In- not, and Support.] Incapable of being supported or borne; unendurable; insufferable; intolerable; as, insupportable burdens; insupportable pain. -- In`sup*port"a*ble*ness, n. -- In`sup*port"a*bly, adv.
Wiktionary
insupportableness
n. The state of being insupportable; insufferableness.