Definition of "unsympathetic"

His tall, gaunt, stringy figure is insensible to fatigue, and his dry, half-sarcastic, and often wholly unsympathetic manner is uninfluenced by any change in his surroundings.

1912, Arthur Conan Doyle, The Lost World […], London, New York, N.Y.: Hodder and Stoughton

After years of unsympathetic commercial use and dereliction, nothing of note remained inside, which accordingly has been reconfigured with modern amenities such as underfloor heating.

2021 December 15, Robin Leleux, “Awards honour the best restoration projects: The Network Rail Community Award: Saltash and Stow”, in RAIL, number 946, page 58