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essential
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niezbędny, podstawowy, konieczny
He was the essential element in the show.
Breathing is essential to life.
It's essential that you have a first-aid kit in your car.
Milk is the essential ingredient of that cocktail.
Sport is essential for being healthy.
Oxygen is essential for living.
Eating healthy food is essential to stay in good shape.
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necessary
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potrzebny, niezbędny, konieczny
I am sure that won't be necessary.
He made some necessary changes in his paper.
Don't call me unless it is absolutely necessary.
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crucial
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kluczowy, niezbędny, istotny, ważny
very important
The crucial changes must come from within the country itself.
You have to answer that crucial question.
He is our team's crucial player.
This is our crucial issue now.
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vital
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intrinsic
,
intrinsical
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indispensable
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imperative
,
imper.
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requisite
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needful
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must-have
This gadget is must-have when you ride a bike.
This phone accessory is must-have.
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nonexpendable
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nonredundant