GRE grumpy Definition Easily annoyed or irritable; in a bad mood. Example "She was grumpy until she had her morning coffee." Sign in to save GRE Quiz → ← grumble guarantee → Study tips featuring "grumpy" Write GRE Words Into Your Own Sentences Related words GRE swill GRE taper GRE testy GRE abacus SAT abase GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate SAT abdomen GRE abduct