IPA: /ʌnˈfɔːtʃənətli/
KK: /ʌnˈfɔrtʃənətli/
This word is used to express regret or disappointment about something that has happened due to bad luck or an unfortunate event.
Unfortunately, the concert was canceled due to the rain.
Unfortunately → It is formed from "un-" (meaning not) and "fortunate" (from Latin "fortunatus", meaning lucky or favored). The word "unfortunately" means not having good luck or being in an unfavorable situation.
Think of 'not' ('un-') being added to 'lucky' ('fortunate') — that's why unfortunately means not lucky.