Being on bad terms with someone; discord or poor relations between people (e.g., family members, colleagues, friends).
兄弟は長年不仲で、ほとんど話をしない。
The brothers have been on bad terms for years and hardly speak to each other.
あの二人は仕事上では協力しているが、個人的には不仲だ。
Those two cooperate at work, but personally they are not on good terms.
不仲を解消するために、話し合いの場を設けた。
A meeting was arranged to resolve the discord.