Lest Alone, Least Alone, Less Alone?

Gez

Senior Member
French (France)
Which, if any, is correct? When you're saying something doesn't have/make/do/etc. something, and even less something else that depends on the first?

For example:
"He won't ever try, lest alone succeed."
"Old sci-fi starships don't even have any electronics, lest alone computers."
"She would never apologize, lest alone make amends."

Is "lest" correct or should it be replaced by something? I didn't find any online reference about that turn of phrase.
 
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