si important / tellement important
Since it's so important please call as soon as it comes.
Puisque c’est si important, appelle dès que ça arrive.
— Memories of Murder (2003)
I asked him what was so important for him here.
Je lui ai demandé ce qui était si important pour lui ici.
— The Princess Bride (1987)
Why is insurance so important?
Pourquoi l'assurance est-elle si importante ?
I know, design's so important these days.
Je sais, le design, c’est tellement important de nos jours.
— Secret Sunshine (2007)
Is it so important to you why I came?
Est-ce que c’est si important pour toi de savoir pourquoi je suis venu ?
— Decision to Leave (2022)
Is it wise to trust Hagrid with something so important?
Est-il judicieux de confier quelque chose d'aussi important à Hagrid ?
— Harry Potter and the Philosopher's Stone (2001)
Since it's so important, I'll take care of it.
Puisque c’est si important, je m’en occuperai.
It is, of course, a trifle, but there is nothing so important as trifles.
Ce n’est, bien sûr, qu’un détail, mais rien n’est aussi important que les détails.