See: callous
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An unmelting blob of "parsley butter" sat on top like a wart.
I found my heart unmelting at Rowling's revelation on Jonathan Ross that she had sobbed writing the penultimate chapter of the seventh, and supposedly last, Potter tome which is published next week.
Even Ohio and Indiana would gradually be encased in thick, unmelting ice, while California and the Great Plains could suffer century-long droughts.