Word(s) to say if someone doesn't want one thing they surely don't want some second thing

Solution 1:

Let alone

Dad I don't want to get out of bed, let alone go to school.

According to Cambridge Dictionary, let alone do something means:

and to an even greater degree do something

Example by Cambridge Dictionary:

Brian would never even read a newspaper, let alone a book.

Attribution: "Let Alone Do Something Meaning in the Cambridge English Dictionary." Cambridge Dictionary. Accessed April 03, 2018. https://dictionary.cambridge.org/dictionary/english/let-alone-do-something.

Solution 2:

The phrase I have typically seen used there is much less.

I don't want to get out of bed, much less go to school.

m-w.com says this phrase is:

used especially in negative contexts to add to one item another denoting something less likely . . .

• And so it appears that he is never going to get out of the eighth grade, much less ever make it to college. —Thomas Meehan

Solution 3:

You can alternatively use the term never mind.

According to Merriam-Webster never mind is defined as:

used especially in negative contexts to add to one term another denoting something less likely; with this knee I can hardly walk, never mind run

Hope this is helpful!