Abnormal and Ill-formed

Abnormal adjective - Being out of the ordinary.

Ill-formed and abnormal are semantically related In some cases you can use "Ill-formed" instead an adjective "Abnormal".

Nearby Words: abnormality, abnormally, abnormity

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

Abnormal and ill-formed are semantically related in shapely topic. You can use "Abnormal" instead an adjective phrase "Ill-formed", if it concerns topics such as formless, shapeless.