The Collaborative International Dictionary of English v.0.48:

Dyslogistic \Dys`lo*gis"tic\, a. [Gr. dys- ill, bad, + ?
   discourse, fr. ? to speak.]
   Unfavorable; not commendatory; -- opposed to eulogistic.
   [1913 Webster]

         There is no course of conduct for which dyslogistic or
         eulogistic epithets may be found.        --J. F.
                                                  Stephen.
   [1913 Webster]

         The paternity of dyslogistic -- no bantling, but now
         almost a centenarian -- is adjudged to that genius of
         common sense, Jeremy Bentham.            --Fitzed.
                                                  Hall.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dyslogistic
    adj 1: expressing disapproval; "dyslogistic terms like `nitwit'
           and `scalawag'" [syn: dyslogistic, dislogistic,
           pejorative]