(a.) Not worthy; wanting merit, value, or fitness; undeserving; worthless; unbecoming; -- often with of.

abominable arrant atrocious bad bad child bad example bad man bad news bad person bad woman base beneath notice black blamable blameworthy contemptible criminal damnable dark despicable discreditable disgraceful dishonorable disreputable disreputable person evil execrable flagitious flagrant foul good-for-nothing heinous ignoble improper ineligible infamous inferior iniquitous knavish low mediocre menial meritless monstrous naughty nefarious no-account no-good nonmeritorious not coming not outstanding nothing objectionable person outrageous paltry peccant persona non grata petty preposterous puny rank reprehensible reprobate scandalous second-rate shameful sinful substandard unacceptable person undeserved undeserving undesirable undue unearned unentitled unequal unfit unforgivable unjustified unmerited unmeriting unowed unowing unpardonable unprofessional unqualified unspeakable unwarranted unworthy of regard valueless vicious vile villainous wicked worthless wrong