An unbeliever. Source: A King James Dictionary. (Used with permission. Copyright © Philip P. Kapusta)
But if any provide not for his own, and specially for those of his own house, he hath denied the faith, and is worse than an INFIDEL. ( 1 Timothy 1:1 Proverbs 5:8 )
Bibliography Information"Entry for 'Infidel'". A King James Dictionary.