无宗教信仰者；异教徒used by people who have a strong religious belief as a way of referring to a person who has no religion or who believes in a religion that is not one of the world's main religions
2.
未开化的人；不文明的人used to refer to a person who shows lack of education
adj.
1.
无宗教信仰的；异教徒的；不文明的connected with heathens
heathen gods
异教的神祇
He set out to convert the heathen(= people who are heathens ) .