Was heißt »Todkranker« auf Englisch?

Das Substantiv »Todkranker« lässt sich wie folgt von Deutsch auf Englisch übersetzen:

Englische Beispielsätze

My dog was very ill.
At first, I thought he was ill.
Helen fell ill shortly after she arrived home.
They are ill.
They're ill.
You're ill.
I stayed at home because I was ill.
As soon as the weather changes, I get ill.
Tell him I've fallen ill.
Mary was ill.
Why have you come to work when you're ill?
Peter had already enquired about holiday offers at a travel agency when his wife suddenly fell ill.
They might be ill.
She could be ill.
She might be ill.
It's possible she's ill.
Tom was ill, so he couldn't come.
Tom seems to be very ill.
I hear you've been ill.
I've heard you've been ill.