Heathen(ish) (5)
I believe the answer is:
pagan
'heathenish' is the definition.
(synonyms)
This is all the clue.
(Other definitions for pagan that I've seen before include "Heathen; non-believer" , "One not accepting your god" , "Infidel" , "Unbeliever" , "advocate of pleasures" .)