A noun/adjective describing one who swears falsely or breaks a solemn oath. Paul includes epiorkoi (perjurers) in his vice list in 1 Timothy 1:10 — behaviors the law rightly restrains and that are contrary to sound doctrine.
The appearance of epiorkos in Paul's vice list (1 Timothy 1:10) alongside murderers, slave traders, and liars is striking — perjury is ranked with violent crimes against persons. This is consistent with the biblical worldview: truth-telling is not merely a social convention but a reflection of the divine nature. God is truth (John 14:6); to lie under oath is therefore a direct offense against the character of the Creator. Paul's purpose is not to condemn but to show the law's proper function: 'the law is not laid down for the just but for the lawless' (1 Timothy 1:9). The redeemed person is transformed by the Spirit of truth into one whose word needs no oath — because their character has become the oath.