Necessary synonyms such as fated, called for, certain, and destined. Necessary is an adjective, and its antonyms are unnecessary, non-essential, and dispensable. Additionally, here are 29 synonyms, related words, and verbs for necessary.
called for, compulsory, de rigueur, demanded, essential, imperative, incumbent, indispensable, mandatory, needed, needful, obligatory, of the essence, required, requisite, and vital.
certain, destined, fated, ineluctable, inescapable, inevitable, inexorable, predestined, predetermined, preordained, sure, and unavoidable.