The compound adjective 'stern-faced' is a relatively modern English formation, combining two elements with deep historical roots. The first element, 'stern', originates from Old English styrne, meaning severe or hard, a term likely describing an unyielding character or demeanor. The second element, 'faced', derives from the Latin facies, which referred broadly to form, appearance, or surface, and evolved in Old French to specify the front part of the head. The logic of the compound is transparently literal: it describes a person whose facial appearance (faced) conveys severity, strictness, or disapproval (stern), effectively projecting an inner attitude through an outward, physical expression.

Structure: stern (severe) + faced (having a face) - stern: From Old English styrne (severe, strict, hard), of Germanic origin. Functions as an adjective describing a quality of harshness or severity. - faced: From the noun face (Old French, from Latin facies form, appearance, face) combined with the suffix -ed, meaning "having or provided with". Functions as a suffix to form an adjective meaning "having a face of a specified kind".