uncongenial, as defined by The Free Dictionary

uncongenial adjective

1. Devoid of harmony and accord

2. Not pleasant or agreeable

The OP rejected inharmonious as too clunky, and incompatible as too absolute. The attitudes of uncongenial colleagues towards each other can be improved by a skillful manager and a willingness to listen on everyone's part.

The source of the uncongeniality may be a small unconscious offence that has festered with time or it may be basic disagreements about non-work related topics. If it is a fundamental difference about the approach to the work, with no one willing to compromise, then you have incompatibility and the team is better broken up. If the OP's problem is how to deal with an uncongenial atmosphere at work, he might pose a question on http://workplace.stackexchange.com/

uncongenial, as defined by The Free Dictionary

uncongenial adjective

1. Devoid of harmony and accord

2. Not pleasant or agreeable

The OP rejected inharmonious as too clunky, and incompatible as too absolute. The attitudes of uncongenial colleagues towards each other can be improved by a skillful manager and a willingness to listen on everyone's part.

The source of the uncongeniality may be a small unconscious offence that has festered with time or it may be basic disagreements about non-work related topics. If it is a fundamental difference about the approach to the work, with no one willing to compromise, then you have incompatibility and the team is better broken up. If the OP's problem is how to deal with an uncongenial atmosphere at work, he might pose a question on https://workplace.stackexchange.com/