Was heißt »äußerstenfalls« auf Englisch?

Das Adverb »äußerstenfalls« (auch: äusserstenfalls) lässt sich wie folgt von Deutsch auf Englisch übersetzen:

Synonyme

Tom has at most three hundred dollars.
The empty intersections adjacent to a stone are its degrees of freedom (at least 1, at most 4). A stone that has no degree of freedom cannot remain on the board.
There'll be twenty people there at most.
There will be twenty people there at most.
"How many meals do you eat in a day?" "At least one, at most three."
The weather report for tomorrow forecasts 12 degrees Celsius at most.
Tom is thirty at most.
You can use English at most hotels around the world.
Although Go is probably the most popular Japanese game in my country, at most only a few university students know it.
She's at most 20 years old.
She is at most 18 years old.
She will pay 50 dollars at most.
I thought she was 30 at most.
She is eighteen at most.
He has at most 100 dollars.
He will pay 20 dollars at most.
I can only pay 100 dollars at most.
The number of mistakes is ten at most.