The quality or state of having a particular disposition or emotional character, as in 'kindhearted-ness' or 'coldhearted-ness.'
From '-hearted' (an adjective suffix) + '-ness' (Old English suffix forming abstract nouns). Creates nouns describing the fundamental emotional character or nature of a person.
English has dozens of '-heartedness' formations (kindhearted, hardhearted, lighthearted, etc.), but we rarely nominalize them into '-heartedness'—which is why these words feel fresh and alive when we do create them.
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