Unnatural or distorted in form; having a deformity; misshapen; disfigured; as, a deformed person; a deformed head.

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"

Original cross-section of sewer altered, pipe probably extensively broken.