The Collaborative International Dictionary of English v.0.48:

Polarize \Po"lar*ize\, v. t. [imp. & p. p. Polarized; p. pr. &
   vb. n. Polarizing.] [Cf. F. polariser.]
   To communicate polarity to.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "polarizing":
   aggressive, bellicose, belligerent, bickering, combative,
   disputatious, divisive, eristic, factional, factious, irascible,
   irritable, litigious, partisan, polemic, pugnacious, quarrelsome,
   shrewish, wrangling