Scrawny (adjective)

1. Thin and bony, especially in a way that is unattractive.
2. Lacking strength or vitality.

Origin:

Derived from the middle english word "scrany" meaning thin and weak.

Examples:

1. The dog looked scrawny and malnourished.
2. He was a scrawny kid, and he never grew up to be very big.
3. The tree was scrawny and not very tall.
4. He looked very scrawny and weak when he came out of the hospital.
5. The bird had a scrawny and underfed look.