Overly thin is a term used to describe someone who is excessively skinny. The term can be broken down into three synonyms: SCRAWNY (7 letters), GAUNT (5 letters), and BONY (4 letters). SCRAWNY is an adjective used to describe someone who is very thin and weak-looking. GAUNT is an adjective used to describe someone who is very thin and haggard in appearance. BONY is an adjective used to describe someone who is very thin and has prominent bones.