Noun
ill feeling (countable and uncountable, plural ill feelings)
A feeling of animosity or resentment.
It got as high as Eisenhower who, with his renowned skill in diplomacy, ensured Montgomery did get his Flying Fortress, though at a great cost in ill feeling. Source: Internet
This reference was later edited out of Gower's Confessio Amantis and it was suggested by one editor citation that this was done because of ill feeling between them, but it is likely due simply to stylistic concerns. Source: Internet