infidel /ˈɪn.fə.dl̩/noun 4adjective 2forms 3 noun4 •(offensive) One who does not believe in a certain religion.The infidel writer is a greater enemy to society. — 1779 •(disapproving) One who does not believe in a certain principle. •(offensive) One with no religious beliefs. •(offensive) An openly Islamophobic individual receiving or seeking praise from other Islamophobic people.I am a proud infidel. I believe in Jesus Chirst, the Son of God who died on the cross for my sins. — 2006 adjective2 •Rejecting a specific religion. •Of, characteristic of, or relating to unbelievers or unbelief. formsinfidels · more infidel · most infidel