The term 'too thin' can be described by four crossword solutions: SCRAWNY (7 letters), GAUNT (5 letters), EMACIATED (9 letters), and BONY (4 letters). SCRAWNY is an adjective used to describe someone who is very thin and has little muscle or fat. GAUNT is an adjective used to describe someone who is very thin and haggard in appearance. EMACIATED is an adjective used to describe someone who is extremely thin due to illness or lack of food. Lastly, BONY is an adjective used to describe someone who is very thin and has prominent bones.