Lacking sensitivity, kindness, or emotional awareness; unfeeling or insensitive.
From 'dull' + 'hearted' (having a certain type of heart or emotional capacity, as in 'kindhearted'). This compound adjective suggests emotional dullness rather than intellectual dullness.
Dullhearted is different from being dull-brained—it's not about being stupid, it's about being emotionally numb and unable to feel or care about others' suffering!
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