noun

1. (now usually derogatory) One who does not believe in a certain religion.

2. (now usually derogatory) One who does not believe in a certain principle.

3. (now usually derogatory) One with no religious beliefs.

Synonyms: atheist, disbeliever, non-believer, nonbeliever, unbeliever

adjective

1. Rejecting a specific religion.

2. Of, characteristic of, or relating to unbelievers or unbelief.