The Collaborative International Dictionary of English v.0.48:
malnourished \malnourished\ adj. Not getting adequate food; suffering from malnutrition; underfed. [Narrower terms: starved, starving; unfed; foodless] [WordNet 1.5]WordNet (r) 3.0 (2006):
malnourished adj 1: not being provided with adequate nourishment [ant: nourished]