"how unfortunately" is a correct and usable phrase in written English.
You can use it when you are expressing surprise, disbelief, or disappointment. For example, "How unfortunately, my application was rejected."
Still, they are contemptuous of backroom deals, and that is how, unfortunately, common ground is found.
"This study adds to growing evidence for the existence of facial cues associated with acute sickness and help us understand how, unfortunately, social stigmas about people suffering illnesses might emerge," he said.
That's how you find out when somebody's birthday takes place, and that's how, unfortunately, you learn some bad news sometimes too.
You can imagine how unfortunately this particular evening turned out.
"The fact that it's that hard, that we're even discussing this, is, I think, a measure of how, unfortunately, the venom and rancor in Washington has prevented us from getting basic work done".
LaValle, chair of the Senate's Higher Education Committee and a former teacher and school administrator, comments about how "unfortunately there have always been some students who have found ways to cheat... instead of learning by researching and writing documents themselves.
It's how we, unfortunately, label certain children.
The gang frequently drinks a brew called Wharmpess, but seeing as how it unfortunately only exists in the world of the show, you'll have to pick a different craft beer.
Unfortunately — how to put this?
This is unfortunately how it happened".
This is how it works unfortunately and that's what has happened to me.
