Puny and Skin and bones

Puny adjective - Of a size that is less than average.

Skin and bones and puny are semantically related In some cases you can use "Skin and bones" instead an adjective "Puny".

Skin and bones noun - A person who is unusually thin and scrawny.

Puny and skin and bones are semantically related in thin topic. Sometimes you can use "Puny" instead an adjective phrase "Skin and bones".