Gaunt and Underfed

Gaunt adjective - Suffering extreme weight loss as a result of hunger or disease.

Underfed and gaunt are semantically related in state topic. In some cases you can use "Underfed" instead an adjective "Gaunt", when it comes to topics like characterisitc, poor.

Underfed adjective - Not getting adequate food.

Gaunt and underfed are semantically related in state topic. You can use "Gaunt" instead an adjective "Underfed", if it concerns topics such as characterisitc, poor.