Search Result for "impugnable": 
Wordnet 3.0

ADJECTIVE (1)

1. subject to being discredited; 



The Collaborative International Dictionary of English v.0.48:

Impugnable \Im*pugn"a*ble\, a.
   Capable of being impugned; that may be gainsaid.
   [1913 Webster]


WordNet (r) 3.0 (2006):

impugnable
    adj 1: subject to being discredited