Necessary
Essential
Synonyms Obligatory, required, mandatory, demanded, called for, essential, vital, incumbent, requisite, compulsory, imperative, needed, needful, indispensable, of the essence, and de rigueur.
Inevitable
Synonyms Inevitable, certain, inescapable, ineluctable, destined, predestined, unavoidable, sure, inexorable, fated, predetermined, and preordained.
Example Sentences
Water is necessary for human survival.
Exercise is necessary for good health.
Proper planning is necessary for success.
Safety measures are always necessary.
It’s necessary to stay focused.