The Greek adjective dilogos (G1351) means 'double-tongued' — saying different things to different people, or saying one thing while meaning another. It describes the sin of inconsistent speech and divided loyalty.
Dilogos appears only once — in the qualifications for deacons (1 Timothy 3:8). Its presence among leadership requirements reveals how seriously the early church took integrity of speech. A double-tongued person destroys trust and cannot effectively serve the gospel. Jesus's standard — 'Let your yes be yes and your no be no' — is the positive counterpart to dilogos.