The Collaborative International Dictionary of English v.0.48:

Prejudicial \Prej`u*di"cial\, a. [L. praejudicialis belonging to
   a preceding judgment: cf. F. pr['e]judiciel.]
   [1913 Webster]
   1. Biased, possessed, or blinded by prejudices; as, to look
      with a prejudicial eye. [Obs.] --Holyday.
      [1913 Webster]

   2. Tending to obstruct or impair; hurtful; injurious;
      disadvantageous; detrimental. --Hooker.
      [1913 Webster]

            His going away . . . was most prejudicial and most
            ruinous to the king's affairs.        --Clarendon.
      [1913 Webster] -- Prej`u*di"cial*ly, adv. --
      Prej`u*di"cial*ness, n.
      [1913 Webster]