IPA: /ˈmɜːrsɪfəl/
KK: /ˈmɜrsɪfəl/
The quality of being kind and forgiving towards others, especially when they have done wrong.
Her mercifulness towards the less fortunate inspired many in the community.
Mercifulness is formed from "merciful" (from Old French *merciful*, meaning full of mercy) and "-ness" (meaning the state or quality of). The word "mercifulness" refers to the quality of being full of mercy or compassion.
Think of being 'full of mercy' ('merciful') and how that quality is described by '-ness' — that's what mercifulness means.