The term 'superskinny' can be described by two crossword solutions: 'BONY' (4 letters) and 'THINASARAIL' (11 letters). BONY is an adjective used to describe a person or animal that is very thin and has little flesh on their bones. Thin as a rail is an idiom used to describe someone who is extremely thin. Together, these two words provide a vivid description of someone who is very thin and has little body fat.