The Collaborative International Dictionary
Heartedness
Heartedness \Heart"ed*ness\, n.
Earnestness; sincerity; heartiness. [R.]
--Clarendon.
Note: See also the Note under Hearted. The analysis of the compounds gives hard-hearted + -ness, rather than hard + heartedness, etc.
Wiktionary
heartedness
n. 1 (context uncountable English) The state or quality of being hearted. 2 (context countable English) The result or product of being hearted.