Home › Words › M › malnourishmalnourishmalnourish means to feed insufficiently, to cause malnutrition.Among words judged in Lexicurio's Arena, malnourish ranks #2,710 of 42,752 for Qualifying.EtymologyFrom mal- + nourish.verbTo feed insufficiently, to cause malnutrition.e.g.“But of course it is we who are letting them down, we whose overconsumption is malnourishing the world.” — 2013, Edith Pearlman, How to Fall: Stories:Definitions & examples from Wiktionary (CC BY-SA 3.0).