From The Collaborative International Dictionary of English v.0.48:
grouchy \grouch"y\ (grouch"[y^]), adj.
given to complaining or grumbling; prone to show annoyance at
slight provocation; irritable.
Syn: crabbed, crabby, cross, fussy, fussbudgety, grumpy,
bad-tempered, ill-tempered.
[WordNet 1.5]