grump(n = noun.person) churl, crank, crosspatch, grouch - a bad-tempered person;
is a kind of disagreeable person, unpleasant person
has particulars: crab, crabby person, fire-eater, hothead, misanthrope, misanthropist
Derived form adjective grumpy₁

grump, n. colloq.
1 a grumpy person.
2 (in pl.) a fit of sulks.

Derivative:
grumpish adj. grumpishly adv.

Etymology:
imit.