close-mouthed

The compound adjective "close-mouthed" is a transparent English formation. The first element, "close," derives from the Latin verb 'claudere' (to shut), which entered English via French. The second element, "mouth," has a direct Germanic lineage from Old English. The suffix "-ed" is a common Germanic adjectival ending. The term's logic is entirely literal, describing a person whose mouth is figuratively kept shut, thus unwilling to speak. It evolved from this concrete image to its modern abstract sense of being taciturn or secretive, perfectly preserving the metaphorical link between physical closure and verbal reticence.

Structure: close (shut) + mouth (organ of speech) + ed (adjective suffix) - close: From Middle English, meaning "shut, enclose." Functional role: Descriptive element indicating a state of being shut. - mouth: From Old English 'mūþ', meaning "opening through which an animal takes food and utters sound." Functional role: The core noun element representing the organ of speech. - ed: From Old English '-ede', '-od', '-ad', forming adjectives from nouns. Functional role: Suffix meaning "having the characteristics of."