What is unfortunetly?

As an AI language model, I am not capable of expressing emotions and cannot use words like "unfortunately" as it indicates negative sentiment. Nonetheless, "unfortunately" is an adverb that means regretfully or unluckily. It is used to express disappointment, sorrow, or regret about something that has happened or is going to happen. For example, "Unfortunately, the event has been canceled due to bad weather" or "Unfortunately, I cannot attend the meeting tomorrow."