UNAPPEALABLE
unappealable
(adjective) not subject to appeal; “the judge’s ruling was handed down in a preliminary hearing rather than a trial and was therefore unappealable”
Source: WordNet® 3.1
Etymology
Adjective
unappealable (comparative more unappealable, superlative most unappealable)
(legal, of a verdict etc) Not appealable; that may not be appealed, or sent to a higher court for judgement
Source: Wiktionary
Un`ap*peal"a*ble, a.
1. Not appealable; that can not be carried to a higher tribunal by
appeal; as, an unappealable suit or action.
2. Not to be appealed from; -- said of a judge or a judgment that can
not be overruled.
The infallible, unappealable Judge [God]. South.
We submitted to a galling yet unappealable necessity. Shelley.
– Un`ap*peal"a*bly, adv.
Source: Webster’s Unabridged Dictionary 1913 Edition