'Grumpy' definitions:

Definition of 'grumpy'

From: WordNet
adjective
Annoyed and irritable [syn: crabbed, crabby, cross, fussy, grouchy, grumpy, bad-tempered, ill- tempered]

Definition of 'Grumpy'

From: GCIDE
  • Grumpy \Grump"y\, a. [Cf. Grumble, and Grum.] Surly; dissatisfied; grouty. [Collog.] --Ferby. [1913 Webster]