grumpiness

UK: /ˈgrʌmpɪnɪs/

WordReference Random House Learner's Dictionary of American English © 2025

grump•y /ˈgrʌmpi/   adj., -i•er, -i•est. 

1. unhappy and bad-tempered;
   grouchy:
   She's always a little grumpy when she wakes up.

grump•i•ness, n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2025

grump•y  (grum′pē), adj., grump•i•er, grump•i•est. 

1. surly or ill-tempered;
   discontentedly or sullenly irritable;
   grouchy.

Also, grump′ish. 

• grump expressive word, first attested in the phrase humps and grumps slights and snubs + -y¹ 1770–80

grump′i•ly, adv. 
grump′i•ness, n.