The term SPOIL THE APPEARANCE OF can be defined by three crossword solutions: DEFACE (6 letters), DISFIGURE (9 letters), and MAR (3 letters). DEFACE means to damage or ruin the surface of something, often with graffiti or other markings. DISFIGURE means to alter someone's or something's appearance in an unattractive way. MAR means to damage or spoil the appearance of something. All three words refer to damaging or ruining the appearance of something, whether it be a person, object, or surface.