Adjective
(physiology, of a diet) deficient in nutrition (providing little nourishment)
(biology, of a body of water) being poor in nutrients and minerals and therefore not having an excessive growth of algae and thus a no diminished oxygen content to other organisms.
Antonym: eutrophic
(geography, of a wetland) deficient in plant nutrients, such as nitrogen or phosphorus.
Source: en.wiktionary.org