Everyone was hurt by his heartless attitude.
The novel depicts the inhumanity of the city.
無情 can mean heartless or pitiless, but also has a nuance of 'transience' in Buddhist contexts, which 非人情 lacks.
Compound of 非 (hi, 'non-') and 人情 (ninjō, 'human feelings, compassion'). The exact historical derivation is uncertain, but the word follows a common pattern of negating a noun to express lack of a quality.