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 PDF — $25 ← grumble guarantee → Related words GRE awe GRE smithereens GRE abacus SAT abase GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate SAT abdomen GRE abduct GRE aberrant