Ill-formed and Unshapely

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

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

Unshapely adjective - Not well-proportioned and pleasing in shape.

Ill-formed and unshapely are semantically related in shapely topic. Sometimes you can use "Ill-formed" instead an adjective "Unshapely", if it concerns topics such as formless, shapeless.