Know how to use "fewer" and "less"? Find out.
c.1400, "to disfigure," from Old French deformer (13c.), from Latin deformare "put out of shape, disfigure," from de- (see de-) + formare (see form (v.)). Related: Deformed; deforming.
deformed de·formed (dĭ-fôrd')adj. Distorted in form.