"serious controversy" is a correct and usable phrase in written English.
It can be used in a sentence when referring to a heated and significant disagreement or dispute on a serious topic. Example: The new government policy has sparked serious controversy among citizens, with some applauding its effectiveness while others criticize its potential consequences.
A serious controversy ensues, with fraternal criticism offered.
The most serious controversy of this Oscar season has surrounded "Zero Dark Thirty".
A social revolution has taken place this week, but without serious controversy or resistance.
Underlying these 'X Factor for computers' competitions is a serious controversy.
The northeastern boundary of the state was a matter of serious controversy between the United States and Britain.
Mitterrand's decision to replace Rocard in 1991 with France's first woman prime minister, Edith Cresson, provoked serious controversy.
Carranza was an ardent nationalist and was involved in serious controversies with the United States.
And remember, he was coming off of a couple of serious controversies from the primaries — Rev. Wright, guns and religion, 'bitter.' " Perceptions that Mr. Obama was Muslim were persistent.
Such activity always provokes vigorous response from Polish scientists (for example Sabath 1990 , 1993 Łomnicki 1994; Graebsch 2006); however, the false impression that "something is wrong with evolution" and that there are "serious controversies among scientists about evolution" is planted in people's minds.
Nudes and rude gestures aside, one of the more serious controversies surrounding this application is the fact that the photos and videos you send actually aren't deleted at all.
Fear and uncertainty related to a thyroid cancer diagnosis, a perception of the diagnosis being dismissed as not "serious," controversies and conflicting messages about adjuvant RAI treatment, and treatment-related side effects, were challenges reported by participants.
