The quality or state of being without compassion, feeling, or courage; emotional unresponsiveness.
'Deadhearted' + '-ness' (abstract noun-forming suffix). Creates an abstract noun describing the condition or quality of having a dead heart.
Deadheartedness is a specific kind of emotional damage—not just sadness or coldness, but an active absence of caring, a hollow space where empathy should live. It suggests not just cruelty but a kind of spiritual emptiness.
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