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

  

unfortunately

 adverb
adverb
BrE BrE//ʌnˈfɔːtʃənətli//
 
; NAmE NAmE//ʌnˈfɔːrtʃənətli//
 
 
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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
See the Oxford Advanced American Dictionary entry: unfortunately