The word 'unavoidable' is a layered construction built upon the core concept of avoidance. The root 'avoid' entered English from French, carrying the Latin sense of actively shunning or escaping something. The suffix '-able' was then attached, transforming the verb into the adjective 'avoidable,' meaning "capable of being avoided." Finally, the Old English negative prefix 'un-' was applied to negate this capability, creating the modern meaning of "not able to be avoided." This logical assembly of morphemes—negation, action, and potentiality—perfectly encapsulates the sense of inevitability or inescapability the word conveys today.

Structure: un (not) + avoid (prevent) + able (capable of) - un: A prefix of Germanic origin (Old English un-), meaning "not." It functions as a negative particle. - avoid: The core verb, from Anglo-French avoider, ultimately from Vulgar Latin \evitare, a derivative of Latin vītāre ("to shun, avoid"). It functions as the lexical root. - able: A suffix of Latin origin (via Old French -able), from Latin -ābilis, meaning "capable of, fit for." It forms adjectives meaning "able to be [verb]ed."