Search Result for "un-american": 
Wordnet 3.0

ADJECTIVE (1)

1. considered contrary to the best interests of the United States; 



The Collaborative International Dictionary of English v.0.48:

Un-American \Un-American\
   See -American.


WordNet (r) 3.0 (2006):

un-American
    adj 1: considered contrary to the best interests of the United
           States


The Devil's Dictionary (1881-1906):

UN-AMERICAN, adj.  Wicked, intolerable, heathenish.