Definition of unfortunately adverb from the Oxford Advanced Learner's Dictionary

Oxford3000

unfortunately

adverb
ʌnˈfɔːtʃənətli
 
; ʌnˈfɔːrtʃənətli
 
 
used to say that a particular situation or fact makes you sad or disappointed, or gets you into a difficult position
Synonym
regrettably
Unfortunately, I won't be able to attend the meeting.I can't make it, unfortunately.Unfortunately for him, the police had been informed and were waiting outside.It won't be finished for a few weeks. Unfortunately!
Opposite
fortunately