What is adjective form of method?

There isn't a single, universally accepted adjective form of "method." However, depending on the context, you could use several options:

General:

* Methodical: This is the most common adjective form, meaning systematic, orderly, and precise.

* Methodic: Similar to methodical, but slightly less common.

Specific to a particular method:

* [Method]-based: For example, "project-based," "scientific-based," "experimental-based."

* [Method]-driven: For example, "data-driven," "goal-driven," "research-driven."

* [Method]-oriented: Similar to "[method]-driven" but often implies a focus on a particular approach.

More nuanced options:

* Methodological: This refers to the study or principles of methods.

* Methodistic: Less common, but can be used to describe something characterized by a strict adherence to a specific method.

The best adjective to use will depend on the specific context and what you want to emphasize.