un-ex-cep-tion-a-ble / ŭn-ĭk-sĕp-shə-nə-bəl
1. perfect; beyond reproach or criticism
Nothing is more essential to the establishment of manners in a State than that all persons employed in places of power and trust must be men of unexceptionable characters.
Samuel Adams, 1722 – 1803
A combination of the English negative prefix un- (not), akin to the Latin negative prefix in-, and the adjective-forming suffix -able, which comes from a combination of the Latin adjective-forming suffix -abilis/ -ibilis/ -bilis (indicating capacity, fitness, suitability, tendency toward, causation) with the Latin feminine noun exceptio, exceptiionis (exception, restriction, limitation), which is derived from the Latin prepositional prefix ex-/ e- (out of, from) and the Latin verb capio, capere, cepi, captus (take, seize, grasp).
Thank you to Allen Ward for providing this etymology.