discord and hostility; feud
A formal compound describing a state of mutual ill will and conflict, often used in political or organizational contexts.
The discord and hostility between the two parties continues, and policies are not moving forward.
The internal feud negatively affected the company's performance.
不和 means discord or disharmony, while 不和反目 adds the nuance of open hostility or a feud.
反目 means enmity or antagonism; 不和反目 combines both discord and hostility into one formal compound.
Compound of 不和 (discord) and 反目 (hostility, literally 'opposing eyes'). The exact historical derivation is uncertain, but the combination reinforces the idea of mutual antagonism.