The Collaborative International Dictionary of English v.0.48:

Prepossess \Pre`pos*sess"\, v. t. [imp. & p. p. Prepossessed;
   p. pr. & vb. n. Prepossessing.]
   [1913 Webster]
   1. To preoccupy, as ground or land; to take previous
      possession of. --Dryden.
      [1913 Webster]

   2. To preoccupy, as the mind or heart, so as to preclude
      other things; hence, to bias or prejudice; to give a
      previous inclination to, for or against anything; esp., to
      induce a favorable opinion beforehand, or at the outset.
      [1913 Webster]

            It created him enemies, and prepossessed the lord
            general.                              --Evelyn.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

39 Moby Thesaurus words for "prepossessed":
   antiblack, besotted, biased, bicolored, chauvinistic, colored,
   doctrinaire, dogmatic, fixated, gripped, held, hung-up, infatuated,
   influenced, interested, jaundiced, know-nothing, monomaniac,
   monomaniacal, nonobjective, obsessed, one-sided, opinionated,
   partial, partisan, possessed, prejudiced, preoccupied, racist,
   sexist, superpatriotic, swayed, tendentious, twisted,
   ultranationalist, undetached, undispassionate, warped,
   xenophobic