unpardonable

too bad to be excused or justified regards cruelty to animals as an unpardonable sin Synonyms indefensible, inexpiable, insupportable, unforgivable, unjustifiable, inexcusable, unwarrantableRelated Words insufferable, intolerable, unbearable, unendurable; abominable, atrocious, heinous, monstrous, outrageous, scandalous, shocking; egregious, flagrant, glaring, gross, rank; unacceptable, untenable; black, evil, iniquitous, vicious, wicked; base, contemptible, deplorable, despicable, dirty, execrable, ignoble, reprobate, vile, wretched; cruel, nasty; blamable, blameworthy, censurable, reprehensible; banned, barred, condemned, disallowed, forbidden, interdicted, outlawed, prohibited, proscribedNear Antonyms acceptable, tolerable; authorized, legal, permissible; allowed, permitted, tolerated; approved, endorsed (also indorsed), sanctioned; abetted, encouraged, promoted, supported; ethical, good, moral, virtuousAntonyms defensible, excusable, forgivable, justifiable, pardonable, venial