five-foot-tall

The compound "five-foot-tall" is a modern English construction built from native Germanic elements. "Five" derives from Old English fīf, from Proto-Germanic fimf, ultimately from Proto-Indo-European pénkʷe. "Foot" comes from Old English fōt, related to the unit of measurement, from Proto-Germanic fōts, from PIE pṓds. "Tall" entered Middle English, likely from Old English getæl meaning "swift, ready," or from a Scandinavian source. The specific syntactic pattern of combining a numeral, a singular unit noun, and a dimension adjective (e.g., "five-year-old," "ten-inch-long") is a grammatical feature of English that creates a unified descriptive modifier, where the unit noun remains in its singular form despite the plural number.

This is a fixed compound adjective formed from three English words: the numeral "five", the noun "foot", and the adjective "tall". It follows a common English pattern for specifying measurements (number + unit + dimension adjective).