Prejudicial

a.	1.
	1.	Biased, possessed, or blinded by prejudices; as, to look with a prejudicial eye.
	2.	Tending to obstruct or impair; hurtful; injurious; disadvantageous; detrimental. His going away . . . was most prejudicial and most ruinous to the king's affairs. - Clarendon.

Adj.

1.

prejudicial - (sometimes followed by `to') causing harm or injury; "damaging to career and reputation"; "the reporter's coverage resulted in prejudicial publicity for the defendant" Synonyms: damaging, detrimental, prejudicious

bad, baleful, baneful, corroding, corrosive, corrupting, corruptive, counterproductive, damaging, deadly, deleterious, detrimental, differential, disadvantageous, discriminative, disserviceable, distressing, evil, forejudged, harmful, hurtful, inimical, injurious, judged beforehand, lethal, malefic, malevolent, malign, malignant, mischievous, noisome, noxious, ominous, pernicious, poisonous, preconceived, preconceptual, preconcluded, predecided, predetermined, predisposed, predispositional, prejudged, prejudging, presumed, presupposed, presurmised, scatheful, toxic, unadvantageous, unfavorable, unprofitable, unrewarding, useless, venenate, veneniferous, venenous, venomous, vicious, virulent, worthless