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Definition of irreligious : 1. Destitute of religion; not controlled by religious motives or principles; ungodly. Cf. Impious.
2. Indicating a want of religion; profane; wicked; as, irreligious speech.

Synonyms:

lapsed, rationalist, nonreligious, nonchurchgoing, nonobservant, atheistical, unorthodox, heathenish, humanism, atheist, heretic, religionless

unfaithful, sinful, unholy, wayward, sacrilegious, unchristian, fallen, blasphemous

heathen, non-practicing, pagan, creedless, nihilistic, worldly, secular, disbelieving, atheistic, non-religious, ungodly, faithless, impious, agnostic, godless, unbelieving, profane, undevout, non-believing, irreverent

Usage examples:

• In an irreligious Republic, as events afterwards proved, the power of the whole clergy was bound to be destroyed. - "Secret Societies And Subversive Movements", Nesta H. Webster.
• " I don't care much about her myself, she is so profane and so dreadfully irreligious. - "Red Pottage", Mary Cholmondeley.
• She could not be essentially irreligious- that were impossible in a true woman. - "Lucy Maud Montgomery Short Stories, 1907 to 1908", Lucy Maud Montgomery.