Simple past tense and past participle of underfeed.
The children who crowd these grimy alleys, half-clad and underfed, shrink away from your outstretched hand as if from a blow.
Sir Henry's own principal contribution to the discussion was rather unfortunate, for while insisting on the blessings derived by England from its free-trade policy, he coupled this with the rhetorical admission (at Bolton in 1903) that "12,000,000 British citizens were underfed and on the verge of hunger."
Goitre and leprosy are the only endemic diseases; but the natives, being underfed, are prone to diarrhoea and dyspepsia.
The Russian army is full of underfed teenage conscripts.