What is unfortunately?

Unfortunately is an adverb that is used to express disappointment, displeasure or regret about a situation or event. It often implies a sense of sadness or frustration. It is commonly used to convey sympathy or express condolences when something unfortunate has occurred. For example, "Unfortunately, the concert was cancelled due to bad weather" or "I'm sorry to hear that you lost your job, unfortunately." The word 'unfortunately' can also be used to soften the impact of a negative statement, as in "Unfortunately, your application has been rejected."