The phrase "are therefore deeply" is correct and usable in written English.
It can be used to express a strong emotional or intellectual response to a preceding statement or situation.
Example: "The researchers have found compelling evidence; they are therefore deeply concerned about the implications of their findings."
Alternatives: "are thus profoundly" or "are consequently very".
"We are therefore deeply disappointed by this ruling and are reviewing the court's decision," the statement said.
"We are therefore deeply concerned about the impact of this judgment on our future income as it opens the floodgates to legal challenges from any aggrieved relative who, for whatever reason, has been left out of someone's will".
"Attempts to measure performance and rank councils in this way are therefore deeply troubling.
Hippopotamids are therefore deeply nested within the family Anthracotheriidae.
Any further moves towards further hiding military operations from the public eye are therefore deeply alarming.
It is therefore deeply associated with the ideology known as deism, an ideology whose greatest triumph was the American Revolution.
It is therefore deeply alarming that they have been sentenced to death, as without a fair trial serious doubts over their guilt will remain.
We were therefore deeply offended by Roger Ailes' recent statement attributing the outrage over Glenn Beck's use of Holocaust and Nazi images to "leftwing rabbis who basically don't think that anybody can ever use the word, Holocaust, on the air".
The fact that all of these men, so late in life, are such fans of works that celebrate individuals who consistently put themselves before others is therefore deeply revealing.
He was therefore deeply involved in the English Heritage effort to save one of their best private houses, Greenside, in Surrey, whose demolition in 2003 by its defiant owner resulted in an exemplary punitive fine.
"No licence for next year's event should be granted and no new deal signed... "That a mindless minority should attempt to ruin the events for everyone, risking its future in the process, is therefore deeply regrettable.
