IPA: /ˈɡriːvəsnəs/
KK: /ˈgrivəsnəs/
The quality of being very serious or severe, often causing great sadness or suffering.
The grievousness of the situation left everyone in shock.
Grievousness is formed from "grievous" (from Old French *grievous*, meaning heavy or serious) and the suffix "-ness" (meaning the state or quality of). The word "grievousness" refers to the state of being serious or heavy, often in a context of sorrow or suffering.
Think of the word 'grievous' meaning serious or heavy, and remember that 'grievousness' refers to the quality of being serious or causing sorrow.