Failing to sympathize; lacking sympathy(adjective)
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Use "unsympathizing" in a sentence
"The secret of our emotions never lies in the bare object, but in its subtle relations to our own past: no wonder the secret escapes the unsympathizing oberver, who might as well put on his spectacles to discern odours."
"He was already enjoying that happiness when that little Napoleon had suddenly appeared with his unsympathizing look of shortsighted delight at the misery of others, and doubts and torments had followed, and only the heavens promised peace."
"Only to the very stupid, perverse, or unsympathizing, was he in the slightest degree dangerous."