bears, bellyachers, complainers, crabs, cranks, croakers, crosspatches, curmudgeons, fussers, gripers, grouches, grousers, growlers, grumblers, grumps, mutterers, sourpusses, whiners
hunksmalcontents, soreheadsgrinches, killjoys, party poopers, spoilsportsdefeatists, pessimistsfaultfinders, kickers, naggers, nitpickers, objectors, quibblers, repinerscrocks(slang), hypochondriacs