strictly forbid
expressly forbid
explicitly forbid

He was actually expressly forbidden to speak to me about the matter.

Indeed, he had expressly forbidden it, and with good reason.

Workers on the site were expressly forbidden from doing so, although the first discovery had in fact been made by one.

Worst of all, she said, calls home were expressly forbidden.

They were expressly forbidden to engage in any other activities, of course.

In fact, they say, state law often expressly forbids them to make many details public.

"I expressly forbade you to have anything to do with this investigation."

The use of such black arts has been known to our people but expressly forbidden.

However, other places do not report suspensions or are expressly forbidden from doing so under state law.

Students are expressly forbidden to take home examples or property belonging to the School.