Definition of "nasty"

nasty

/ˈnaː.sti/

adjective
comparative nastier, superlative nastiest
1. (now chiefly US) Dirty, filthy.
  Quotations
  In such condition, there is no place for Industry; because the fruit thereof is uncertain: and consequently no Culture of the Earth; no Navigation, nor use of the commodities that may be imported by Sea; no commodious Building; no Instruments of moving, and removing such things as require much force; no Knowledge of the face of the Earth; no account of Time; no Arts; no Letters; no Society; and which is worst of all, continuall feare, and danger of violent death; And the life of man, solitary, poore, nasty, brutish, and short.
  1651, Thomas Hobbes, Leviathan
  I really don't have any friends at school Mama Mia. They talk about me all the time. They say my hair's nappy and my clothes are nasty.
  2006, Marie Fontaine, The Chronicles of my Ghetto Street Volume One, page 156
2. Contemptible, unpleasant (of a person).
  Quotations
  Jonathan kept staring at him, till I was afraid he would notice. I feared he might take it ill, he looked so fierce and nasty.
  1897, Bram Stoker, Dracula, New York, N.Y.: Modern Library
3. Objectionable, unpleasant (of a thing); repellent, offensive.
  Quotations
  ‘It's a nasty trade,’ said Mr. Limbkins, when Gamfield had again stated his wish.
  1838, Boz [pseudonym; Charles Dickens], Oliver Twist; or, The Parish Boy’s Progress. […], volumes (please specify |volume=I, II, or III), London: Richard Bentley, […]
4. Indecent or offensive; obscene, lewd.
  Quotations
  He said to Mr. Tallboy he thought the headline was a bit hot. And Mr. Tallboy said he had a nasty mind.
  1933, Dorothy L Sayers, Murder Must Advertise
  We want threesomes, blowjobs, and orgies. That's just the way it is. We want the good girl who's nasty in bed.
  2009, Okera H, Be Your Priority, Not His Option, Mill City Press, published 2009, page 45
5. Spiteful, unkind.
  Quotations
  She had said: "I love the block button on Twitter. I don't know how people expect to send a nasty comment and not get blocked."
  2012 June 3, The Guardian
6. (chiefly UK) Awkward, difficult to navigate; dangerous.
  Quotations
  There was a nasty period during the First World War when the family's allegiance was called into question - not least because one of the Schroders had been made a baron by the Kaiser.
  2007 August 5, The Observer
7. (chiefly UK) Grave or dangerous (of an accident, illness etc.).
  Quotations
  Moving into the middle ages, William the Conqueror managed to rout the English and rule the country, then see off numerous plots and assassination attempts, before his horse did for him in a nasty fall, killing him at 60.
  2012 March 2, James Ball, The Guardian
8. (slang, chiefly US) Formidable, terrific; wicked.
  Quotations
  "Well," she grinned, looking hot and sexy. "They say you doing some real nasty shit in the NBA, but on the mic you a little too competitive. They say you a gaming niggah who likes to keep up all kinds of go-to-war gangsta friction between rappers. That shit must work for you though, huh? You stickin' all over the charts when other artists are failin' off. They rotating your cuts on the radio like mad too."
  2006, Noire [pseudonym], Thug-A-Licious: An Urban Erotic Tale, New York, N.Y.: One World/Ballantine Books, page 15
noun
plural nasties
1. (informal) Something nasty.
2. (euphemistic, slang, preceded by "the") Sexual intercourse.
3. A video nasty.
  Quotations
  In this way, it is hoped that the nasties will be dealt with, and the remainder regularized.
  1984, ThirdWay, volume 7, number 5, page 17
  Jones evokes the nasties discursively to brand the Splat Pack as 'authentic outlaws'.
  2014, mark Bernard, Selling the Splat Pack: The DVD Revolution and the American Horror Film