ill-shapen vs malformed

ill-shapen and malformed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
ill-shapen	No	Yes	No	No
malformed	No	Yes	No	No

As adjectives, ill-shapen and malformed are synonyms defined as:

Other synonyms of ill-shapen include deformed, distorted, misshapen.

ill-shapen (adjective)	malformed (adjective)
so badly formed or out of shape as to be ugly	so badly formed or out of shape as to be ugly