1. in the sense of essential
- requisite
- obligatory
- compulsory
- required
- imperative
- mandatory
- needed
- demanded
- needful
- called for
- indispensable
- essential
- of the essence
- vital
- de rigueur
- incumbent
2. in the sense of inevitable
- unavoidable
- inevitable
- sure
- certain
- inexorable
- inescapable
- fated
- ineluctable
- predetermined
- destined
- preordained
- predestined
Example Sentences of Necessary
1. Water is necessary for human survival.
2. Exercise is necessary for good health.
3. Proper planning is necessary for success.
4. Safety measures are always necessary.
5. It’s necessary to stay focused.