← BackshareGuessgrumpy/ˈɡrʌmpi/adjectiveIn a bad mood and easily annoyed; tending to complain.My dad is always grumpy before he has his morning coffee.The grumpy old man shouted at the kids for playing too loudly.She gets grumpy when she's tired or hungry.SynonymscrankyirritablegrouchysulkyAntonymscheerfulhappy