Wiktionary
regretable
adv. (alternative spelling of regrettable English)
Usage examples of "regretable".
On the other hand, frightening sprats like the regretable Hangrell isn't going to make you any friends either.
Strangely enough, the first indications of it were found in some remarks by Riklin in popular articles printed in Swiss literature, from which the general public learned, even before Riklin's closest colleagues, that psychoanalysis had succeeded in overcoming some regretable mistakes which discredited it.
Charge would only have to stick till something regretable happened in the dungeons.