the compound adjective 'sure-footed' is a native english formation, combining the old english concept of stability with the physical basis of movement. the first element, 'sure', traces back to latin 'securus' (free from care), which entered english via old french, evolving to mean 'firmly established'. the second element, 'foot', is a fundamental germanic word from pie 'pṓds'. the suffix '-ed' attaches to noun compounds to create adjectives denoting possession of a quality. the literal meaning, 'having secure feet', was applied first to animals like goats navigating rocky terrain, and then metaphorically extended to describe human confidence and steadiness in action or judgment.

Structure: sure (firm, secure) + foot (foot) + ed (having the quality of) sure (from latin 'securus', meaning 'safe, secure', functioning as an adjective meaning 'firm'); foot (from old english 'fōt', meaning 'foot', functioning as a noun); ed (from old english '-ed', a suffix forming adjectives meaning 'having, characterized by').