the word "unembarrassed" is formed by adding the old english negative prefix "un-" to the past participle "embarrassed." the core verb "embarrass" entered english in the late 16th century from french 'embarrasser', which itself derived from spanish/portuguese 'embarazar', meaning to obstruct or impede, likely from a root related to a barrier. the original sense was literal, concerning physical obstruction, but it evolved metaphorically to describe a state of mental or social hindrance—feeling awkward or ashamed. therefore, "unembarrassed" literally means "not placed in a state of impediment," logically extending to its modern meaning of being free from shame or awkwardness.

Structure: un (not) + embarrass (cause to feel awkward) + ed (adjective suffix) un- (old english, a prefix meaning "not"); embarrass (french/spanish/portuguese, from the root meaning to obstruct or impede); -ed (old english, a suffix forming adjectives from verbs or nouns).