hard-working

The compound adjective 'hard-working' is a transparent formation from two native English elements. The adverb 'hard' derives from the Proto-Germanic 'hardu-', meaning "hard, brave", which itself stems from the Proto-Indo-European root 'kar-', "hard". The participial adjective 'working' originates from the Old English verb for labor, 'wyrcan', from the Proto-Germanic 'werkōną'. The compound's logic is perfectly literal: to be "working hard" or "laboring with vigor". It emerged in the 17th century, reflecting a cultural valuation of diligent, persistent effort as a character trait, directly combining the sense of strenuous activity ('hard') with the state of being engaged in labor ('working').

Structure: hard (with effort) + working (engaged in work) - hard: From Old English 'heard', meaning "solid, firm, severe, difficult". In this compound, it functions as an intensifying adverb meaning "with great effort or vigor". - working: From Old English 'weorcian', meaning "to perform, to work". It is the present participle form of the verb 'work', functioning as an adjective meaning "engaged in work".