Would a native say 心底から申し上げる? What's a better way to say "speaking with genuine sincerity...."


I've always thought / said that "心底から申し上げる" means "I am saying this with
highest level of sincerity (bottom of my heart)"

"心底から申し上げて、お詫びいたします。" _I very sorry for what I have done._

Google search says "心底から申し上げる" is used only 650 times, which suggests 心底 and
申し上げる is very rare and not a natural pairing of words.

So, if I want to express that apologies, respect, love, condolences are coming
from my "inner most thoughts", "bottom of my heart", "not superficial", is
there a word to substitute for "心底"? Is it so context based on each emotion,
it is on a case by case basis and there's no simple answer?

And, what impressions does "心底から申し上げて、お詫びいたします。" give?




> 心底から申し上げて、お詫びいたします。

This is at least grammatical, but sounds like something awkward like "I put it
honestly, and (then) I apologize" or "I apologize by saying it from the bottom
of my heart".

The common expression is simply 心からお詫びを申し上げます. 心底から/心底より is probably not
wrong, but it's much less common than 心から/心より.




> 心底から申し上げて、お詫びいたします。

This is at least grammatical, but sounds like something awkward like "I put it
honestly, and (then) I apologize" or "I apologize by saying it from the bottom
of my heart".

The common expression is simply 心からお詫びを申し上げます. 心底から/心底より is probably not
wrong, but it's much less common than 心から/心より.

