The word 'unworldly' is a modern English formation built from native Germanic elements. Its core, 'world,' originates from Old English 'woruld,' which combined terms for "age" and "man," originally conveying the sense of "human life on earth." The negative prefix 'un-' directly inverts the core concept, creating the meaning "not of this world." Over time, this literal sense evolved into two main abstract meanings: one describing a person detached from material concerns, and another describing something with an ethereal, almost supernatural quality. The adjectival suffix '-ly' finalizes the transformation from a noun phrase into a stable descriptive term.

Structure: un (not) + world (the earth, human existence) + ly (having the qualities of) un: A prefix of Germanic origin (Old English) meaning "not," used to form negatives. world: From Old English 'woruld,' meaning "human existence, the affairs of life." Its functional role is the core noun. ly: A suffix of Germanic origin (Old English '-lic') used to form adjectives meaning "having the qualities of."