[uhn-der-nur-isht, -nuhr-]
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  1. not nourished with sufficient or proper food to maintain or promote health or normal growth.
  2. not given essential elements for proper development: emotionally undernourished.

Origin of undernourished

First recorded in 1925–30; under- + nourish + -ed2
Related formsun·der·nour·ish·ment, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for undernourished

also under-nourished, 1910, from under + past participle of nourish.

Online Etymology Dictionary, © 2010 Douglas Harper