IPA: /ˈɡlʌmnəs/
KK: /ɡlʌmnəs/
A state of feeling sad or gloomy.
His glumness was evident as he sat quietly in the corner.
Glumness is derived from the adjective "glum" (from Old Norse "glumr", meaning gloomy or sullen) combined with the suffix "-ness" (meaning the state or quality of). The word "glumness" refers to the state of being gloomy or sullen.
Think of the word 'glum' which means gloomy, and remember that 'glumness' describes the state of feeling gloomy.