noun, na-adjective
cold-hearted; callous; pitiless; unsympathetic
Describes a person or attitude that is emotionally cold, lacking compassion or warmth. Often used in literary or emphatic contexts.
彼の冷淡無情な態度に、周囲は驚いた。
People around him were surprised by his cold-hearted attitude.
冷淡無情な判断を下すのは辛い。
It's painful to make a callous decision.
A yojijukugo (four-character compound) combining 冷淡 (cold, indifferent) and 無情 (heartless, unfeeling). The exact historical derivation is uncertain, but the meaning is transparent from its components.