The adjective apathetic means someone has little or no feelings or emotions. It can also mean someone has no interest or concern.
Synonyms are uninterested, indifferent, passive or unconcerned.
The word origins 1744 from apathetick which is modeled on pathetic. The word is key in the 1942 novel The Stranger by Albert Camus (French author). The main character is indifferent or apathetic in almost everything, including the death of his mother. Two days later he kills a man and is sentenced to death. The reader does not feel much sympathy and might feel dislike for the character.
The criminals were light-hearted and apathetic people.
The king lost all his followers because of incapable and apathetic way of ruling the country.
A survey found that the public was apathetic about the current political situation.