Ill-formed and Misshapen

Ill-formed adjective - Not grammatical; not conforming to the rules of grammar or accepted usage.

Misshapen and ill-formed are semantically related. in shapely topic. In some cases you can use "Misshapen" instead an adjective phrase "Ill-formed", when it comes to topics like formless, shapeless.

Misshapen adjective - Badly or imperfectly formed.

Ill-formed and misshapen are semantically related. You can use "Ill-formed" instead an adjective "Misshapen".