Search Result for "alienator": 
Wordnet 3.0

NOUN (1)

1. an unpleasant person who causes friendly people to become indifferent or unfriendly or hostile; 



The Collaborative International Dictionary of English v.0.48:

Alienator \Al"ien*a"tor\, n.
   One who alienates.
   [1913 Webster]


WordNet (r) 3.0 (2006):

alienator
    n 1: an unpleasant person who causes friendly people to become
         indifferent or unfriendly or hostile