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Definition of irreverent : Not reverent; showing a want of reverence; expressive of a want of veneration; as, an irreverent babbler; an irreverent jest.

Synonyms:

fresh, spirited, overbold, aweless, sassy, smart, respect, awless, wise, pert, extraneous, immaterial, orthogonal

improper, impudent

callous, saucy, arrogant, brash, rude, discourteous, impertinent, cheeky, outrageous, defiant, outspoken, brazen, disrespectful, candid, audacious, impolite, flagrant, insubordinate, mouthy, presumptuous, insolent, contemptuous, sacrilegious, bold, derisive, sarcastic

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

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

Usage examples:

• An odd, irreverent way the old fellow has with him- for an old fellow pretending to believe what he says!" - "Weighed and Wanting", George MacDonald.
• And even if they did not, still we are not so irreverent as to interfere with the arrangements of those who have gone before us, laughed Lyon Berners. - "Cruel As The Grave", Mrs. Emma D. E. N. Southworth.
• The old highlander was not irreverent, but the thing would have been unintelligible to him. - "Malcolm", George MacDonald.