Definition of unfortunately adverb from the Oxford Advanced American Dictionary

  

unfortunately

 adverb
adverb
NAmE//ʌnˈfɔrtʃənətli//
 
 
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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 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 Learner's Dictionary entry: unfortunately