na-adjective, adverb, noun, noun which may take the genitive case particle 'no'
unfortunately; sorry, but ...
Expresses regret or apology when something is inconvenient or contrary to one's wishes. Often used at the beginning of a sentence to soften a refusal or bad news.
Unfortunately, I have plans today.
あいにくの雨で、ピクニックは中止になった。
The picnic was canceled due to the unfortunate rain.
Unfortunately, because of the rain, the picnic was cancelled.
I'm sorry, but the manager isn't at his desk right now.
I'm afraid I already have plans that day.