- The definition of grumpy is irritable or grouchy.
An example of grumpy is a person who is always complaining and unhappy.
A grumpy old man.
grumpy definition by Webster's New World
grumpy definition by American Heritage Dictionary
adjective grump·i·er, grump·i·est
Surly and peevish; cranky.
- grumpˈi·ly adverb
- grumpˈi·ness noun