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See more synonyms for ratty on Thesaurus.com
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.
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Origin of ratty

First recorded in 1860–65; rat + -y1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for ratty


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
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Derived Formsrattily, adverbrattiness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for ratty


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

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Online Etymology Dictionary, © 2010 Douglas Harper