unbelievers is a form of:

Unbeliever



noun
1.
(one who does not believe, skeptic) អ្នកមិនជឿ, អ្នកក្រៅសាសនា
ENGLISH MEANING
noun
1.
One who does not believe; an incredulous person; a doubter; a skeptic.
2.
A disbeliever; especially, one who does not believe that the Bible is a divine revelation, and holds that Christ was neither a divine nor a supernatural person; an infidel; a freethinker.