English
grumness
From grum + -ness.
Formed from grum + -ness
Proto-Germanic *gramaz ‘angry, bearing a grudge’
Old English grom ‘angry, wrathful’
Middle English grom ‘a boy’
English grum
Today it means
noun The quality of being grum (morose or sullen).
Language periods are conventional ranges, not dates for this word.
Etymograph / grumness