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Adjective: stroppy (stroppier,stroppiest)  stró-pee
Usage: Brit, informal
  1. Obstreperous
    "However you are perfectly entitled to get stroppy if you can't have what you want";
    - bolshy [Brit, informal], bolshie [Brit, informal]

Derived forms: stroppier, stroppiest

See also: obstinate, stubborn, unregenerate