the word unformed is a compound adjective built from english's native and latinate layers. the prefix "un-", of germanic origin, is a prolific negator in english. the core noun "form" entered english via old french from the latin "forma," which originally denoted a mold or shaping device, possibly with an etruscan origin. the suffix "-ed" is used to convert the noun into a participial adjective, describing a state. thus, the literal construction "not having been given shape" directly yields the modern meanings of lacking definite structure, order, or development.

Structure: un (not) + form (shape) + ed (adjective suffix) un- (old english, a prefix meaning "not"); form (latin 'forma', meaning "shape, mold, appearance"); -ed (old english, an adjectival suffix indicating a state or condition).