From kopos ('labor/fatigue'). Kopiao means to work to the point of exhaustion โ hard, sustained, wearying toil. It is used for agricultural labor, manual work, apostolic ministry, and the fatigue of Christ.
Kopiao appears at the well of Sychar: Jesus 'wearied (kekopiakos) with his journey, sat thus on the well' (John 4:6). The eternal Son of God, clothed in flesh, truly grew weary. This is the incarnation's weight โ divinity bearing the full burden of human creatureliness. Yet this wearied Jesus offers 'living water' to the weary woman. Paul uses kopiao for apostolic labor in all his letters โ 'I labored more abundantly than they all' (1 Cor. 15:10). The promise for those who kopiao in the Lord: 'their works do follow them' (Rev. 14:13), and 'in due season we shall reap, if we faint not' (Gal. 6:9).