Which is correct regret or regrettable?

If you wish to express your remorse for the inappropriate toast you made at that wedding you would describe yourself as regretful (“full of regret”), but were you to describe the toast itself it would be better to refer to it as regrettable (“deserving regret”).

What does regrettable mean?

: causing sorrow or disappointment a regrettable mistake. Other Words from regrettable. regrettably \ -​blē \ adverb.