The word 'unexpectedness' is a layered construction in English, built upon the core Latin verb expectare, meaning "to look out for." The prefix 'un-' of Germanic origin is attached to negate the participle 'expected,' creating the adjective 'unexpected' to describe something not looked for. Finally, the native English suffix '-ness,' which forms abstract nouns indicating a state or quality, is appended. Thus, the term logically progresses from the act of anticipation, to its negation, and finally to the abstract condition of that negated state, encapsulating the concept of surprise in its very structure.

Structure: un (not) + expect (anticipate) + ness (state of) - un: A prefix of Germanic origin (Old English, Old High German) meaning "not," used to form negatives. - expect: A root from Latin expectare ("to look out for, await"), from ex- ("out") + spectare ("to look"). - ness: A noun-forming suffix of Germanic origin (Old English -nes(s)), used to denote a state, quality, or condition.