the word 'unrealizable' is a modern english formation built upon the established verb 'realize,' which entered english from french 'réaliser' in the early 17th century. the french term itself derives from medieval latin 'realis,' meaning "relating to things," from latin 'res' (thing, matter). the negative prefix 'un-,' of old english origin, is a common and productive element for negation. the suffix '-able,' of latin origin via french, indicates capacity or possibility. therefore, the literal morphemic construction "not capable of being made real" directly and logically maps to its modern abstract meaning, describing goals or ideas that cannot be brought into existence or achieved.

Structure: un (not) + realiz(e) (to make real) + able (capable of) - un: a prefix of germanic origin (old english) meaning "not," serving a negating function. - realiz(e): a verb of latin origin (via french), from the root 'realis' (real) and the verbal suffix '-ize', meaning "to make real." - able: a suffix of latin origin (via french), from '-abilis', meaning "capable of, fit for."