The term 'thin and bony' can be described by three words: SCRAWNY (7 letters), GAUNT (5 letters), and ANGULAR (7 letters). SCRAWNY is an adjective used to describe someone who is very thin and weak-looking, often due to malnutrition or illness. GAUNT is an adjective used to describe someone who is very thin and haggard-looking, often due to illness or exhaustion. ANGULAR is an adjective used to describe someone who is thin and has sharp facial features. All three words are used to describe someone who is thin and bony.