WordReference Random House Learner's Dictionary of American English © 2019
nas•ty /ˈnæsti/USA pronunciation   adj.,  -ti•er, -ti•est, n., pl.  -ties. 
  1. offensive to taste, smell, or the senses in general; nauseating:a nasty smell of garbage.
  2. indecent or obscene:nasty language.
  3. highly objectionable or unpleasant:a nasty habit.
  4. vicious, angry, threatening, or ugly:A nasty dog guards his store at night.
  5. bad to deal with or experience:a nasty accident.
nas•ti•ly /ˈnæstəli/USA pronunciation  adv. 
nas•ti•ness, n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2019
nas•ty  (nastē),USA pronunciation adj.,  -ti•er, -ti•est, n., pl.  -ties. 
  1. physically filthy;
    disgustingly unclean:a nasty pigsty of a room.
  2. offensive to taste or smell;
  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.;
    serious:a nasty cut; a nasty accident.
  6. very unpleasant or disagreeable:nasty weather.
  7. morally filthy;
    indecent:a nasty word.
  8. Slang Termsformidable:The young pitcher has a good fast ball and a nasty curve.

  1. Informal Termsa nasty person or thing.
nasti•ly, adv. 
nasti•ness, n. 
  • ?
  • Middle English 1350–1400
    • 1.See corresponding entry in Unabridged . dirty, foul, loathsome.
    • 2.See corresponding entry in Unabridged . sickening, repulsive, repellent.
    • 6.See corresponding entry in Unabridged stormy, inclement.
    • 7.See corresponding entry in Unabridged . smutty, pornographic.
    • 1.See corresponding entry in Unabridged . clean, pure.

  • a combining form with the meaning "nastic pressure,'' of the kind or in the direction specified by the initial element:hyponasty.
    • Greek nast(ós) pressed close (see nastic) + -y3

    Collins Concise English Dictionary © HarperCollins Publishers::

    nasty /ˈnɑːstɪ/ adj ( -tier, -tiest)
    1. unpleasant, offensive, or repugnant
    2. (of an experience, condition, etc) unpleasant, dangerous, or painful: a nasty wound
    3. spiteful, abusive, or ill-natured
    4. obscene or indecent
    n ( pl -ties)
    1. an offensive or unpleasant person or thing: a video nasty
    Etymology: 14th Century: origin obscure; probably related to Swedish dialect nasket and Dutch nestig dirty

    ˈnastily adv ˈnastiness n

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