YOU SAID:

He said, to his chagrin.

INTO JAPANESE

彼は悔しそうに言った。

BACK INTO ENGLISH

he said regrettably.

INTO JAPANESE

彼は残念そうに言った。

BACK INTO ENGLISH

he said regretfully.

INTO JAPANESE

彼は残念そうに言った。

BACK INTO ENGLISH

he said regretfully.