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Synonyms for grump


noun

A person who habitually complains or grumbles:

complainer, crab, faultfinder, grouch, growler, grumbler, murmurer, mutterer, whiner. (Informal) crank, griper, grouser. (Slang) bellyacher, sorehead, sourpuss. See happy
verb

To express negative feelings, especially of dissatisfaction or resentment:

complain, grouch, whine. (Informal) crab, gripe, grouse, kick. (Slang) beef, bellyache, bitch. See feelings, happy

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