seriously ill
Elle tomba gravement malade et mourut l'année suivante.
She fell seriously ill and died the following year.
— Souvenirs de Marnie (2014)
Il est très gravement malade, et puis il est complètement seul.
He is very seriously ill, and then he is completely alone.
— Les Invasions barbares (2003)
On dit qu'il serait gravement malade.
They say he is seriously ill.
Je te préviens, je suis gravement malade !
Just so you know, I’m seriously ill!
Je tiens pour certain que Marie est gravement malade.
I am certain that Mary is seriously ill.
Harry est tombé gravement malade.
Harry fell seriously ill.
Nous avons un patient qui est gravement malade.
We have a patient who is critically ill.