transcription, транскрипция: [ rɪgretəb(ə)l ]
You describe something as regrettable when you think that it is bad and that it should not happen or have happened. ( FORMAL )
...an investigation into what the army described as a regrettable incident...
= unfortunate
ADJ [ feelings ]
• re‧gret‧tably
Regrettably we could find no sign of the man and the search was terminated...
= unfortunately
ADV : ADV with cl , ADV adj