undernäring bedeutet auf Englisch

malnutrition▼(lack of adequate nourishment)
noun
[UK: ˌmæl.njuː.ˈtrɪʃ.n̩] [US: ˌmæl.nuː.ˈtrɪʃ.n̩]Sami was reduced to skin and bones by years of malnutrition. = Sam var bara skinn och ben efter år av undernäring.

undernourishment▼(insufficient nourishment)
noun
[UK: ˌʌn.də.ˈnʌ.rɪ.ʃmənt] [US: ˌʌn.də.ˈnʌ.rɪ.ʃmənt]