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nas·ti·est, noun, plural nas·ties. adjective 1. physically filthy; disgustingly unclean: a nasty pigsty of a room. 2. offensive to taste or smell; nauseating. 3. offensive; objectionable: a nasty habit. 4. vicious, spiteful, or ugly: a nasty dog; a nasty rumor. 5. bad or hard to deal with, encounter, undergo, etc.; dangerous; serious: a nasty cut; a nasty accident. This is what Niki is..
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