/in"fi dl, -del'/ , n.
1. Relig.
a. a person who does not accept a particular faith, esp. Christianity.
b. (in Christian use) an unbeliever, esp. a Muslim.
c. (in Muslim use) a person who does not accept the Islamic faith; kaffir.
2. a person who has no religious faith; unbeliever.
3. (loosely) a person who disbelieves or doubts a particular theory, belief, creed, etc.; skeptic.
adj.
4. not accepting a particular faith, esp. Christianity or Islam; heathen.
5. without religious faith.
6. due to or manifesting unbelief: infidel ideas.
7. rejecting the Christian religion while accepting no other; not believing in the Bible or any Christian divine revelation.
8. Also, infidelic /in'fi del"ik/ . of, pertaining to, or characteristic of unbelievers or infidels.
[ 1425-75; late ME infidelis unbelieving, L: unfaithful, treacherous. See IN- 3 , FEAL ]
Syn. 1-3. See atheist .