conversely

from WordNet (r) 3.0 (2006)

conversely
    adv 1: with the terms of the relation reversed; "conversely, not
           all women are mothers"

from The Collaborative International Dictionary of English v.0.48

Conversely \Con"verse*ly\ (? or ?; 277), adv.
   In a converse manner; with change of order or relation;
   reciprocally. --J. S. Mill.
   [1913 Webster]