The quality or state of being opposed to or lacking sensitivity, particularly emotional responsiveness or awareness.
From Greek 'anti-' (against) combined with 'sensitivity' (from Latin 'sensitivus', meaning capable of sensation). This compound emerged in modern English to describe the opposite of being sensitive or responsive.
This word appears rarely in everyday speech but becomes important in psychology and neuroscience when discussing conditions where people have reduced emotional processing or empathy—essentially the opposite of what makes us human-centered and compassionate.
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