Nonpartisan

Fits when competing sides receive balanced treatment

Careful Balance in one instance does not prove institutional independence from party interests.

Fits when no side is supported in a particular dispute

Careful Neutrality can mean avoiding a position, while nonpartisan work may strongly advocate a policy.

Fits when two major political parties explicitly cooperate or support something

Careful Bipartisan still involves parties and may exclude independents or smaller groups.

Fits when participants from several parties work together

Careful The phrase describes membership, not whether the work itself avoids party bias.

Fits when an actor is not controlled by another organization or party

Careful Independence does not guarantee fairness or freedom from ideological preference.

Fits when something does not engage with politics at all

Careful Nonpartisan activity can be deeply political while remaining independent of parties.

Fits when a decision-maker must avoid favoring any side

Careful Impartial is broader and can apply outside politics without saying anything about party affiliation.

Fits when principle or public duty is presented as more important than party advantage

Careful This rhetorical phrase can make a grand claim and may hide real political preferences.