〜はおろか
JLPT N1 Concession and contrastlet alone; not to mention
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はおろか means that not just the obvious thing but even a more basic one is the case, usually negatively. Attach it to a noun, often paired with も or さえ in the second clause. It emphasizes the extent by ruling out even the lesser case.
Examples
は、もなかった。 Kanji wa oroka, hiragana mo kakenakatta.
Let alone kanji, he couldn't even write hiragana.
は、さえたが。 Kaigai wa oroka, kokunai ryokou sae shita koto ga nai.
Not to mention abroad, I've never even traveled domestically.