verb (used with object), un·der·fed, un·der·feed·ing.
Examples from the Web for underfed
The animal was so underfed that his ribs were showing under his lusterless chestnut coat.
The animals are mostly worked far too early, and underfed, and the majority are consequently undersized and of poor quality.Notes on Agriculture in Cyprus and Its Products|William Bevan
The children who crowd these grimy alleys, half-clad and underfed, shrink away from your outstretched hand as if from a blow.Story of My Life|Helen Keller
I ain't sure of the word, but I believe that means thin-blooded or underfed.Rimrock Trail|J. Allan Dunn