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Adjective: peckish  pe-kish
  1. [Brit] Somewhat hungry
  2. [N. Amer, informal] Easily irritated or annoyed
    "an incorrigibly peckish young man";
    - cranky [informal], fractious, irritable, nettlesome, peevish, pettish, petulant, scratchy, testy, tetchy, techy, pouty, narky [Brit, slang]

See also: hungry, ill-natured