adj. monotheistic, of or about monotheism (belief in one God)

nm. monotheist, advocate of the belief in only one deity

adj. monotheistic, of or about monotheism (belief in one God)

n. monotheist, believer in a single God; advocate of the belief in only one deity

monotheist

(n./adj.) = monotheist.
Ex: One of the most common assertions made by monotheists is that polytheism is 'idolatry'.

(adj.) = monotheistic.
Ex: I don't think that killing in polytheistic societies gives monotheistic religion the right to do the same, that's not a justified excuse.