Another Word for Necessary: 12 Synonyms with Examples
“Necessary” means needed or required. Some synonyms are stronger, and some suggest a rule or obligation.
As an adjective: needed in order to achieve something
- needed
- required
- essential
- vital
- indispensable
- requisite
- compulsory
- mandatory
As an adjective: unavoidable
- inevitable
- unavoidable
- certain
- inescapable
Need a different word?Look up any word in the synonym finder →
How they differ
Synonyms share a meaning, not always a tone. Here is when to pick each of the main options.
- required
- Often by a rule, list or authority.
- essential
- Stronger: absolutely necessary.
- compulsory
- Required by law or a rule; you have no choice.
- requisite
- Formal; used before a noun: “the requisite skills”.
- inevitable
- For outcomes that cannot be avoided, not things you need.
Example sentences
- required: A valid passport is required for travel.
- essential: Good lighting is essential in a workshop.
- compulsory: Maths is compulsory until the age of sixteen.
- requisite: Few applicants had the requisite experience.
- inevitable: Some delays were inevitable with a project this size.
Opposite of necessary
- unnecessary
- optional
- needless
- inessential
More from WordNet
Less common or more specialised words WordNet lists for other senses of “necessary”. Check the meaning before you use one.
noun: necessity, requirement
WordNet 3.1, Princeton University. Used under the WordNet licence.
Frequently asked questions
What is another word for “necessary”?
The most useful alternatives are “needed”, “required”, “essential”, “vital”, “indispensable”. For the main sense (needed in order to achieve something), “needed” is usually the closest swap.
What is the difference between “required” and “essential”?
required: Often by a rule, list or authority. essential: Stronger: absolutely necessary.
What is the opposite of “necessary”?
Common antonyms are “unnecessary”, “optional”, “needless”, “inessential”.