An example of grumpy is a person who is always complaining and unhappy.
Tommy feels grumpy today because his friend stole his ball.
Michael Finnell was grumpy, but became even grumpier when the Celtics lost.
He'd been in a grumpy mood since he got up.
She headed for the door, tossing a grumpy reply over her shoulder.
Dean simply shook his head, committed to being grumpy for the entire day.
A grumpy meow drew her gaze to Xander's cat, who rubbed its face against her leg.
Fred O'Conner, dressed for the slopes, gave a grumpy wave.