Something malformed has a shape that's twisted or warped, or otherwise distorted. Your first try at making pottery might result in a couple of malformed bowls.

If you leave a doll in the hot sunlight for hours, she may melt and become malformed. Sometimes parts of the body are malformed because of birth defects or accidents. If you're born with a malformed spine, you may wear a brace to straighten it out. If your feet are malformed, your choice of shoes will be limited. Malformed combines the prefix mal-, "badly or wrongly," with formed, from the Latin forma, "shape or appearance."

Definitions of malformed

adj so badly formed or out of shape as to be ugly

“a limp caused by a malformed foot”
deformed, distorted, ill-shapen, misshapen
not well-proportioned and pleasing in shape

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