でさえも

even

→ で
phrase Rare #20,729
even Emphasizes that the statement applies to an unexpectedly unlikely example, often following a noun.
JA: 彼は自分の名前でさえも書けない。
EN: He can't even write his own name.

その娘はたいそう美しいので非常に冷静な男でさえも彼女に惹かれる。

That girl is so beautiful that even a very composed man would be attracted to her.

俺は息子でさえも 警戒してる

I'm wary even of my own son.

— グッドフェローズ (1990)

大きな病気にかかった場合でさえも、希望はすばらしい武器となる。

Even when faced with a serious illness, hope can be a powerful weapon.

彼の先生でさえも彼の言うことを理解しなかった。

Even his teacher couldn't understand what he was saying.

彼の召使いでさえも彼を軽蔑した。

Even his servants looked down on him.

彼女は自分の母国語でさえも間違えてしまいます。

She even makes mistakes in her native language.

我々は一年、一期間でさえもそこに到達できないかもしれない。

We may not be able to get there in a year—not even within a single term.

最も利口な生徒でさえもばかげた間違いをすることがある。

Even the most intelligent students can make foolish mistakes.