(Biochemistry) Being a substance that is required for normal functioning but cannot be synthesized by the body and therefore must be included in the diet:
The definition of indispensable is essential or absolutely necessary.
The definition of requisite is something required or necessary.
The definition of important is having great significance or consequence.
Find another word for needful. In this page you can discover 10 synonyms, antonyms, idiomatic expressions, and related words for needful, like: essential, indispensable, necessary, required, requisite, important, needed, desirous, necessarie and proper-to.