The Collaborative International Dictionary
Unsupportably
Unsupportable \Un`sup*port"a*ble\, a.
Insupportable; unendurable. -- Un`sup*port"a*ble*ness, n.
--Bp. Wilkins. -- Un`sup*port"a*bly, adv.
Wiktionary
unsupportably
adv. in an unsupportable manner