From rat +‎ -y.


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ratty (comparative rattier, superlative rattiest)

  1. Similar to a rat; ratlike.
  2. Infested with rats.
  3. (colloquial) In poor condition or repair
    Synonyms: worn out, battered, tattered, torn
    • 2000, George RR Martin, A Storm of Swords, Bantam 2011, p. 535:
      The Marcher lord was still clad in his ratty black cloak and dented breastplate with its chipped enamel lightning.
    • 2006, Clive James, North Face of Soho, Picador 2007, p. 80:
      I was having exactly that thought on a ratty mock-leather couch in Islington.
  4. (Britain, colloquial) Irritable, annoyed, bad-tempered.
    • 2009, Ian McDonald, River of Gods:
      He got bad, he got ratty, he would take it out on people around him. He was mean when it turned against him.