na-adjective, noun
Describes a person, action, or attitude lacking human warmth, compassion, or natural feeling. Often used in literary or critical contexts.
彼の非人情な態度に皆が傷ついた。
Everyone was hurt by his heartless attitude.
その小説は都会の非人情さを描
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.