Could care less and Hard-hearted

Hard-hearted and could care less are semantically related In some cases you can use "Hard-hearted" instead an adjective phrase "Could care less".

Hard-hearted adjective - Having or showing a lack of sympathy or tender feelings.

Could care less and hard-hearted are semantically related in oblivious to topic. Sometimes you can use "Could care less" instead an adjective phrase "Hard-hearted".