An unpleasant or disagreeable action, taste or smell(noun)
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Use "nastiness" in a sentence
"It takes courage to put it out there in the first place but then to step back far enough to deconstruct and come to terms with all of this nastiness is truly admirable."
"Obama. will suceed dispite all the nastiness from the far right"
"Irrational, philosophically uneducated (calling four of the most popular philosophers peddlers of irrationality and then holding up Ayn Rand of all people), homophobic, heterosexist, backward, and perhaps s few things equal in nastiness to the words you directed against me and every like me."