The Collaborative International Dictionary
Impardonable
Impardonable \Im*par"don*a*ble\, a. [Cf. F. impardonnable.]
Unpardonable. [Obs.]
--South.
Wiktionary
impardonable
a. (context obsolete English) unpardonable
Usage examples of "impardonable".
Had he not sported so well and so recently, he might not have withstood the temptation, the impardonable thrill.