This adjective means 'truthful' or 'incapable of lying,' often applied to deities or oracles in classical Greek. Paul uses it of God in Titus 1:2: 'God, who does not lie (ἀψευδής), promised eternal life before the ages began.' The term underscores divine reliability—God's word is utterly trustworthy because His nature precludes deception. Classical usage frequently describes oracles and seers as ἀψευδής, but Paul applies it exclusively to Yahweh, whose promises are guaranteed by His unchanging character. In a world of false claims and broken promises, the ἀψευδής God is the anchor of Christian hope.