Unfortunately (4)
'unfortunately' is the definition.
('alas' is used to express regret)
This is all the clue.
(Other definitions for alas that I've seen before include "Regrettably, unfortunately" , "woebegone expression" , "What a shame!" , "express regret thus" , "-- and alack!" .)
'unfortunately' is the definition.
(synonyms)
This is all the clue.
(Other definitions for sadly that I've seen before include "Alas" , "Unhappily" , "I regret to say" , "Regrettably" , "With sorrow" .)
'unfortunately' is the definition.
(synonyms)
This is the entire clue.
(Another definition for regrettably that I've seen is " I'm afraid".)