Search Result for "unnavigable": 
Wordnet 3.0

ADJECTIVE (1)

1. incapable of being navigated; 



The Collaborative International Dictionary of English v.0.48:

Unnavigable \Unnavigable\
   See navigable.


WordNet (r) 3.0 (2006):

unnavigable
    adj 1: incapable of being navigated