The term 'Beauty is only skin-deep' is an ADAGE, which means that physical beauty is not as important as inner beauty. This phrase is often used to remind people that looks are not the most important thing in life. The crossword solutions for this term are 'ADAGE' (5 letters), 'COSMETIC' (8 letters), 'TATTOO' (6 letters), and 'tattoos' (7 letters). These words all relate to the idea of physical beauty, but they also emphasize that beauty is only skin-deep and that it is not the most important thing in life.