Lacking sensitivity or compassion; emotionally insensitive or callous in manner.
Compound of 'blunt' and 'hearted,' using the metaphorical connection between the heart and emotions. This mirrors similar formations like 'coldhearted' and 'hardhearted.'
Before psychology existed, English speakers used phrases like 'blunt-hearted' to describe what we'd now call emotional trauma responses—language anticipated what neuroscience would later prove.
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