Someone who holds a bad or wrong belief; a heretic, an unbeliever.

plural of misbeliever

(intransitive) To believe incorrectly; hold to a false belief. / (transitive) To disbelieve; doubt.

simple past tense and past participle of misbelieve

Third-person singular simple present indicative form of misbelieve

present participle of misbelieve

The refusal to believe something; disbelief, or an instance of this.

plural of misbelieving