• Webster's Revised Unabridged Dictionary
    • a Irreverend Irreverent. "Immodest speech, or irreverend gesture."
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Century Dictionary and Cyclopedia
    • irreverend Not reverend; unworthy of reverence; devoid of dignity or respectability: as, the irreverend old age of a miser.
    • irreverend Irreverent.
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In literature:

Can we ask this most irreverend and unclerical of men to meet a young lady?
"The Queen of Hearts" by Wilkie Collins
Now, I know you will ask how a laugh can be irreverend.
"Blackwood's Edinburgh Magazine, Volume 61, No. 378, April, 1847" by Various
A sardonic grimness lies in that irreverend Reverence of Autun.
"Library of the World's Best Literature, Ancient and Modern, Vol. VIII" by Various
How can you be so irreverend, Phyllida?
"The Passionate Elopement" by Compton Mackenzie