尚更

1. Origins, structure, and basic meaning

• Structure: The adverb 尚更 (なおさら) strengthens an existing reason or degree to mean all the more or even more so.
• Basic usage: It intensifies manner in 尚更慎重に, and the repeated situation can be omitted in 祭りの日は尚更だ.

2. Common pitfalls and similar expressions

• An increase prompted by prior context
  • It adds degree in response to a preceding reason or comparison rather than merely meaning very.