Below are the words that matched your query...
Unjustifiable
- incapable of being justified or explained
Unwarrantable
- incapable of being justified or explained
Unwarranted
- incapable of being justified or explained
- lacking justification or authorization; "desire for undue private profit"; "unwarranted limitations of personal freedom"
- without a basis in reason or fact; "baseless gossip"; "the allegations proved groundless"; "idle fears"; "unfounded suspicions"; "unwarranted jealousy"
- Not deserving
Unpassable
- incapable of being passed
Unsurmountable
- incapable of being surmounted or climbed
- not capable of being surmounted or overcome; "insurmountable disadvantages"
Unclimbable
- incapable of being surmounted or climbed
- incapable of being ascended
Unnavigable
- incapable of being navigated
Untraversable
- incapable of being traversed
Unimpassioned
- free from emotional appeal; marked by reasonableness; "answered with an unimpassioned defense"; "the unimpassioned intellect"
Ultimo
- in or of the month preceding the present one; "your letter received on the 29th ult"