so badly formed or out of shape as to be ugly; "deformed thalidomide babies"; "his poor distorted limbs"; "an ill-shapen vase"; "a limp caused by a malformed foot"; "misshapen old fingers"
If people or parts of their body are malformed, they do not have the shape or form that they are supposed to, especially when they have been like this since birth. malformed babies More rarely, the tubes have been malformed from birth. = deformed. if a part of someone's body is malformed, it is badly formed = deformed