よもや
surely not, I never imagined
よもや + 〜まい / 〜ないだろう / 〜とは思わなかった
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よもや strongly doubts that something could happen, or expresses shock that it did: よもや負けるとは思わなかった, "I never imagined we would lose".
It's a literary, more intense version of まさか (N3), and they're often interchangeable. The ending is negative or doubtful: まい, ないだろう, とは思わなかった, or とは alone for shock.
A common use is a pointed warning: よもや忘れてはいないだろうね, "you haven't forgotten, surely?". The speaker suspects the worst.
Compare もしや, "could it be…?", which suspects that something is true. よもや insists that it surely isn't.
Examples
よもや負けるとは思わなかった。
I never imagined we would lose.
よもや彼が嘘をつくことはあるまい。
Surely he wouldn't lie.
よもやこんな結果になるとは。
Who'd have thought it would end like this?
よもや約束を忘れてはいないだろうね。
You haven't forgotten our promise, surely?
よもや本気ではあるまい。
Surely he isn't serious.