the compound adjective 'sweet-scented' is a transparent english formation. the first element, 'sweet', originates from old english 'swēte', which carried meanings related to taste and, by extension, pleasantness in general, including smell. the second element derives from the verb 'scent', which entered english from old french 'sentir' (to feel, smell), itself from latin 'sentire'. the past participle form '-ed' is added to create an adjective meaning 'having a scent'. the logic of the compound is straightforwardly descriptive, combining the idea of a pleasant quality ('sweet') with the state of having an odor ('scented') to specifically denote something emitting a fragrant smell.

Structure: sweet (pleasant smell) + scented (having a smell) sweet (old english, meaning pleasant, fragrant) + scented (from english 'scent', of french/latin origin, meaning a smell, with the adjectival suffix '-ed')