Prejudicial /(?)/

Prej·u·di·cial

Prejudicial

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