re ‧ gret ‧ ta ‧ ble /rɪˈɡretəb ə l/ BrE AmE adjective
[ Word Family: adverb : ↑ regrettably , ↑ regretfully ; adjective : ↑ regrettable , ↑ regretful ; verb : ↑ regret ; noun : ↑ regret ]
something that is regrettable is unpleasant, and you wish things could be different SYN unfortunate :
This was a very regrettable error.
it is regrettable that
It’s regrettable that classical music receives so little attention.