The phrase "tremendously complicated" is correct and can be used in written English.
It is typically used to describe something that is extremely complicated or difficult to understand. Example: "The instructions for building the IKEA furniture were tremendously complicated, and it took me hours to put it together."
"The tax implications are tremendously complicated," the executive close to the discussions said.
The decline of New Orleans's port is a tremendously complicated affair that can't be fully told here.
"We are talking about a tremendously complicated and contentious political process," said Tobias Harris, a Japan analyst at Teneo Intelligence, a New York political risk consultancy.
Corporate officials said calculating the ratio, which would affect all 9,000 public U.S. companies, is tremendously complicated and of little value to investors.
If you want to make a really complicated decision — like buying furniture, which is tremendously complicated — it's best to look at the furniture, occupy your mind with something else, and then go with your gut.
He said he liked the idea of continuing with two systems of regulation for press and broadcasting but even that distinction would become "tremendously complicated", as newspapers developed their websites and started appearing on electronic TV programme guides.
Bill in turn has tremendously conflicted, complicated feelings about his brother and longs to get out from under his shadow.
"The abortion issue is a tremendously nuanced and complicated one.
Winding down Andersen's business is a tremendously messy and complicated task.
The complexity level of ROI analysis increases tremendously by the complicated nature of TBI that generally involves a combination of focal and diffuse injury mechanisms.
In this regard, if a sign language interpreting glove was made of homogeneous MWCNT-PDMS sheets, the cost would be lowered tremendously because it would be possible to eliminate any complicated attachments on the glove surface.
