Emphasizing Importance:
* Crucial: This emphasizes the central role it plays, without which things would fall apart.
* Essential: This highlights the absolute need for it.
* Indispensable: This implies that it's impossible to do without.
* Vital: This emphasizes its importance for life or success.
* Non-negotiable: This emphasizes that it cannot be compromised or disregarded.
* Paramount: This suggests that it's the most important thing.
Emphasizing Necessity:
* Mandatory: This indicates a requirement that must be followed.
* Imperative: This implies an urgent need for action.
* Required: This highlights the need for it to be present.
* Obligatory: This indicates a duty or responsibility to do or have it.
* Necessary: This is a neutral term, simply indicating that it's needed.
* Invaluable: This emphasizes the high value placed on it.
Combining Importance and Necessity:
* Absolutely necessary: This combines both importance and necessity in a strong way.
* Of the utmost importance: This emphasizes the high level of importance.
* Essential for survival: This highlights the need for it to sustain life.
* A cornerstone of success: This emphasizes its role in achieving positive outcomes.
* The foundation of...: This suggests it's the basis upon which everything else is built.
Examples:
* "Clean water is crucial for human health."
* "A strong education is essential for success in life."
* "Trust is indispensable in any relationship."
* "Oxygen is vital for survival."
* "Following the safety guidelines is mandatory."
* "It is absolutely necessary to address this issue immediately."
The best way to describe something as extremely important and necessary will depend on the specific context and the message you want to convey.