Grammar Info
N1 Lesson 10: 19/22

こそすれ〜ない こそすれ〜ない and certainly not, but certainly not, but, although, even though

[する]Verb + こそすれ + Phrase[ない]
Verb[ます]+ こそすれ + Phrase[ない]
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使用域 硬い
  • (A) こそすれ (B), when followed by the clause ending with a negative form is used in written language to strongly emphasize that (A) is the case, certainly not (B). This grammar construction has roots in Classical Japanese where こそ forces the predicate into the realis form (已然形). Normally こそ would emphasize (A), but when the realis form is in the middle of the sentence it expresses concession. This pattern can be seen in other combinations like こそなれ and こそあれ.
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The security incidents will only increase, certainly not decrease.
Novel : ‘In reality, however, the swordsman's blazing desire for vengeance was intensifying, and certainly not cooling down at all.’
The strange phenomenon was surprising for many, and certainly not terrifying.

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Sou Matome Bunpou N1
Page 70