An adjective describing speech or argument that is convincing or rhetorically persuasive. Paul uses it negatively in 1 Corinthians 2:4, stating his message did not come with 'persuasive words of wisdom' but with demonstration of the Spirit's power. The term highlights human rhetorical skill as opposed to divine power. Classical rhetoric valued persuasive speech, but Paul deliberately contrasts such eloquence with Spirit-empowered proclamation.