Synonyms of the word 
UNDERNOURISHED → MALNOURISHED - UNDERFED
undernourished
- adj. Provided with insufficient nourishment to sustain proper health and growth.
malnourished
- adj. suffering from malnutrition.
- v. simple past tense and past participle of malnourish.
underfed
- adj. Inadequately fed.
- v. simple past tense and past participle of underfeed.
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