1: ἄπιστος
(Strong's #571 — Adjective — apistos — ap'-is-tos )

an adjective, is used as a noun, rendered "unbeliever" in 2—Corinthians 6:15; 1—Timothy 5:8 , RV; plural in 1—Corinthians 6:6; 2—Corinthians 6:14; AV only, Luke 12:46 (RV, "unfaithful"). See BELIEF , C, Note (3) FAITHLESS, INCREDIBLE.