жизненно важный in English:

Her vital signs are being closely monitored.

Regular exercise is absolutely vital.

On the other hand, there seem to be those among young folk who, while touching on Buddhism, have started to think of it as a vital spiritual support.

Water is a natural resource of vital importance.

Public opinion plays a vital in the political realm.

That red cloth is a "fukusa"; it is a vital tool used to cleanse the tea equipment.

It is better not to become ill in the first place and early diagnosis is vital.

What conditions are vital for developing film? Dark conditions are vital for developing film.

Some care staff say that they never practise restraint - that it is always wrong under any circumstances. Others say it can be vital, for the resident and themselves

It is vital that you inform me about your progress. It is vital to be honest with your spouse.

It’s vital for pilots and controllers to have good English.

Developing a sucessful strategy is a vital part of the planning process.

Although he's 70 years old, he's still a vital man.

Now that you mention it, I wasn't involved in the decision-making for the vital part.

This is essentiale

Pocket calculators are as cheap to buy as a pair of socks, and as essential to thousands of British school children as a pencil and eraser.

From our human experience and history, at least as far as I am informed, I know that everything essential and great has only emerged when human beings had a home and were rooted in a tradition. Today’s literature is, for instance, largely destructive.

Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety.

An essential condition for a helpful interview is a quiet room in which doctor and parents can sit comfortably and in private without being interrupted.

I'm sure you're thinking to yourself, 'Why is this guy making such a big deal of this?' But make no mistake. This is essential.

The command of communication skills in multiple languages is essential to any company providing goods and services on the world market.

Some knowledge of foreign languages, of Spanish in particular, is essential.

Some Westerners may think our houses are lacking in everything they consider essential.

When the articles of incorporation are complete it is essential to go to the notary public's office to undertake certification of the articles drawn up.

she's a spacial filmmaker, she has absolutly incredible way of telling the story, and it was essential

Elle magazine has a great section on fall’s essential boots and bags.

The essential problem to choose summer holiday will be absence one of my colleague at work.