adjective, rat·ti·er, rat·ti·est.

  1. full of rats.
  2. of or characteristic of a rat.
  3. wretched; shabby: a ratty, old overcoat.
  4. Slang. irritable or angry; bad-tempered; nasty: I always feel ratty when I wake up.

adjective -tier or -tiest

  1. British and NZ informal irritable; annoyed
  2. informal (of the hair) unkempt or greasy
  3. US and Canadian slang shabby; dilapidated
  4. Australian slang
    1. angry
    2. mad
  5. of, like, or full of rats

1856, “resembling a rat;” 1865, “full of rats;” 1867, “wretched, miserable, shabby,” from rat (n.) + -y (2).

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