Search Result for "challengeable": 
Wordnet 3.0

ADJECTIVE (1)

1. capable of being challenged; 



The Collaborative International Dictionary of English v.0.48:

Challengeable \Chal"lenge*a*ble\, a.
   That may be challenged.
   [1913 Webster]


WordNet (r) 3.0 (2006):

challengeable
    adj 1: capable of being challenged