The meaning of Faithless in the Bible
(From International Standard Bible Encyclopedia)

fath'-les: The translation of apistos, "without faith," having the sense of "unbelieving," "disbelieving." Jesus upbraids the people, "O faithless and perverse generation!" (Matthew 17:17; Mark 9:19; Luke 9:41); He says to Thomas, "Be not faithless, but believing" (John 20:27); the Revised Version (British and American) adds, "If we are faithless," instead of "believe not" (II Timothy 2:13); compare I Corinthians 7:12-15; I Corinthians 10:27; I Corinthians 14:22, I Corinthians 14:24, etc.; Titus 1:15. In Luke 12:46 apistos has the sense of "unfaithful," so the Revised Version (British and American); perhaps also Revelation 21:8, "unbelieving."

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