What is the adjective form for litigate?

There isn't a commonly used adjective form of "litigate." However, there are several options depending on the specific meaning you want to convey:

Formal:

* Litigious: This is the most common and accurate adjective, meaning "inclined to sue or be involved in lawsuits."

* Contentious: This adjective refers to something that is likely to cause disagreement or argument, which is often associated with legal disputes.

Informal:

* Lawsuit-prone: This informal phrase describes something or someone that frequently ends up involved in lawsuits.

* Law-bound: This informal term refers to something that is governed by the law or subject to legal proceedings.

Other possibilities:

* Legal: This adjective broadly refers to anything related to the law.

* Judicial: This adjective refers specifically to courts or judges.

The best option will depend on the specific context and the meaning you wish to express.