Answer: grouch

AnswerCrossword Clue
GROUCHScrooge, for one
grouchill-tempered person
grouchto be sulky
grouchto complain (to express discontent)
GROUCHBellyacher
GROUCHGrudge
GROUCHCrab
GROUCHOscar, e.g.
GROUCHChronic complainer
GROUCHOscar, for one
GROUCHSulky person
GROUCHSulky person.
GROUCHAnti-social sulker.
GROUCHCranky character
GROUCHOscar, notably
GROUCHOscar of "Sesame Street," e.g.
GROUCHHard-to-please sort