7 meanings : 1. unpleasant, offensive, or repugnant 2. (of an experience, condition, etc) unpleasant, dangerous, or painful 3..... Click for more definitions. NASTY definition : 1. bad or very unpleasant: 2. unkind: 3. dangerous or violent: . Learn more. NASTY meaning : 1. bad or very unpleasant: 2. unkind: 3. dangerous or violent: . Learn more. Something nasty is filthy, foul, dirty, or awful. Nasty isn't a word for anything nice.
