YOU SAID:

He said so, to his chagrin.

INTO JAPANESE

彼は悔しそうにそう言った。

BACK INTO ENGLISH

He said this with regret.

INTO JAPANESE

彼は残念そうにそう言った。

BACK INTO ENGLISH

He said this regretfully.

INTO JAPANESE

彼は残念そうにそう言った。

BACK INTO ENGLISH

He said this regretfully.