• WordNet 3.6
    • adv dirtily in a filthy unclean manner "a dirtily dressed camel driver"
    • adv dirtily in a sordid manner "as dirtily drunk as usual"
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Webster's Revised Unabridged Dictionary
    • adv Dirtily In a dirty manner; foully; nastily; filthily; meanly; sordidly.
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Century Dictionary and Cyclopedia
    • dirtily In a dirty manner; foully; nastily; filthily.
    • dirtily Meanly; sordidly; by low means.
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In literature:

And soon I became quite familiar with the devious, vicious, dirtily-pleasant eroticism of Soho.
"Tono Bungay" by H. G. Wells
I expostulated, and desired that he should have his in a mug; affirming that I could not taste the liquid treated so dirtily.
"Wuthering Heights" by Emily Bronte
They did not look like simple peasants, although they had long beards and were dressed very dirtily.
"Beasts, Men and Gods" by Ferdinand Ossendowski
He looks like his land, as heavily and dirtily, as stubbornly.
"Character Writings of the 17th Century" by Various
The dirtily dressed one-eyed old woman entered.
"Klytia" by George Taylor
If you get money by that, no matter: it is "clean money," however dirtily got.
"Speeches, Addresses, and Occasional Sermons, Volume 3 (of 3)" by Theodore Parker

In news:

Denver ABC Affiliate Airs Dirtily Doctored Image of Petraeus Biography (Video).