Interminable is a related term of prolonged.
As adjectives the difference between interminable and prolonged
is that interminable is existing or occurring without interruption or end; ceaseless, unending while prolonged is lengthy in duration; extended; protracted.
As a verb prolonged is
(prolong).
prolonged
English
Adjective
(
en adjective)
lengthy in duration; extended; protracted.
Antonyms
* brief
Verb
(head)
(prolong)