the word 'unarguable' is a modern english formation built upon the established adjective 'arguable'. the core root 'argu-' originates from the latin verb 'arguere', which carried meanings of making something clear, proving, or asserting. this latin term is thought to possibly derive from a proto-indo-european root meaning "to shine, be white, clear". the suffix '-able', of latin origin via french, attaches to verbs to form adjectives meaning "capable of". the negative prefix 'un-', of old english origin, is then added to negate the entire concept, creating a word that literally means "not capable of being argued". the semantic evolution moved from the idea of making a clear proof in latin to the modern sense of a point so definitively true that it cannot be contested.

Structure: un (not) + argu (to argue) + able (capable of) un: a prefix of germanic origin (old english) meaning "not". argu: a bound root derived from the latin verb 'arguere', meaning "to make clear, to prove, to accuse". able: a suffix of latin origin (via old french) meaning "capable of, fit for".