申もうし訳わけないくらい

expression, adverb, noun which may take the genitive case particle 'no'

so ... that one feels sorry; to an apologetic degree

Used adverbially or adjectivally to express that something is so extreme (good, bad, much, etc.) that it makes the speaker feel guilty or apologetic. Often follows an adjective or verb in て-form.

• 彼かれは申もうし訳わけないくらい親しん切せつにしてくれた。

  He was so kind to me that I felt almost guilty.

• 申もうし訳わけないくらい簡かん単たんに勝かってしまった。

  I won so easily that I felt a bit sorry.