1. [Brit] Somewhat hungry
   "Feeling peckish, he decided to grab a quick snack"; "The peckish hikers were glad to see the trail mix"
    
2. [N. Amer, informal] Easily irritated or annoyed
   "The peckish customer complained about everything";
   - cranky [informal], fractious, irritable, nettlesome, peevish, pettish, petulant, scratchy, testy, tetchy, techy, pouty, narky [Brit, slang]

See also: hungry, ill-natured