grumness

From grum +‎ -ness.

grumness (uncountable)

1. (rare, archaic) The quality of being grum (morose or sullen).
   • 1675, [William] Wycherley, The Country-wife, a Comedy, […], London: Printed for Thomas Dring, […], →OCLC; republished London: Printed for T[homas] Dring, and sold by R. Bentley, and S. Magnes […], 1688, →OCLC, Act I, scene i, page 8:

     Hor. Well, Jack, by thy long abſence from the Town, the grumneſs of thy countenance, and the ſlovenlyneſs of thy habit; I ſhou'd give thee joy, ſhou'd I not, of Marriage?

• “grumness”, in Collins English Dictionary.
• “grumness, n.”, in OED Online ⁠, Oxford: Oxford University Press, launched 2000.