the compound adjective 'squinty-eyed' is a relatively modern english formation that vividly combines two descriptive elements. the first part, 'squinty', originates from the late middle english verb 'squint', which described the action of looking with the eyes partly closed, a term likely influenced by low german or dutch words for a sidelong glance. the second element, 'eyed', is an ancient english suffixal construction from 'eye', tracing back to proto-germanic 'augô'. when combined, the literal meaning is "having eyes that are characterized by squinting." this logical compounding creates a term that efficiently conveys both a physical appearance and the potential attitudes—such as suspicion, intense focus, or visual impairment—associated with that particular facial expression.

Structure: squinty + eyed - squinty: derived from the verb 'squint' (of middle english origin, possibly from a dutch or low german word meaning 'to squint') + the adjectival suffix '-y' (of old english origin, meaning 'characterized by' or 'full of'). - eyed: derived from the noun 'eye' (from old english 'ēage', of proto-germanic origin) + the suffix '-ed' (of old english origin, meaning 'having' or 'provided with').