appeal

As a verb appeal

is (obsolete) to accuse (someone of something).

As a noun appeal

is (legal) (a) an application for the removal of a cause or suit from an inferior to a superior judge or court for re-examination or review (b) the mode of proceeding by which such removal is effected (c) the right of appeal (d) an accusation; a process which formerly might be instituted by one private person against another for some heinous crime demanding punishment for the particular injury suffered, rather than for the offense against the public (e) an accusation of a felon at common law by one of his accomplices, which accomplice was then called an approver.

As an adjective unappealable is

(legal|of a verdict etc) not appealable; that may not be appealed, or sent to a higher court for judgement.

As nouns the difference between appeal and prooftext

is that appeal is (legal) (a) an application for the removal of a cause or suit from an inferior to a superior judge or court for re-examination or review (b) the mode of proceeding by which such removal is effected (c) the right of appeal (d) an accusation; a process which formerly might be instituted by one private person against another for some heinous crime demanding punishment for the particular injury suffered, rather than for the offense against the public (e) an accusation of a felon at common law by one of his accomplices, which accomplice was then called an approver while prooftext is the practice of using decontextualized quotations from a document (often, but not always, a book of the bible) to establish a proposition rhetorically through an appeal to authority.

As a verb appeal

is (obsolete) to accuse (someone of something).