adjective, grump·i·er, grump·i·est.
surly or ill-tempered; discontentedly or sullenly irritable; grouchy.
Literature’s Most Lovable GrumpsLiterature is full of chipper lemonade-makers, but there’s something about those lemon-sucking grumps that draws readers in.
sullen, grouchy, cantankerous, testy, crotchety, surly, irritable, bad-tempered, crabby, cross, disgruntled, dissatisfied, grumbling, peevish, petulant, querulous, sulky, truculent, griping, pettish
Origin of grumpy
1770–80; grump expressive word, first attested in the phrase humps and grumps slights and snubs + -y1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for grumpiest
"You're the grumpiest old curmudgeon I ever knew," said Gordon, interrupting my cogitations.A Top-Floor Idyl|George van Schaick
adjective grumpier or grumpiest
peevish; sulkyAlso: grumpish
Word Origin for grumpy
C18: from grump + -y 1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Online Etymology Dictionary, © 2010 Douglas Harper