"vehemently express" is a correct and usable phrase in written English.
It means to strongly or forcefully convey something. You can use it in formal or informal writing to emphasize the intensity of someone's words or emotions. Example: The crowd vehemently expressed their dissatisfaction with the new policy by chanting and waving signs.
But the greatest obstacle to Lorca's exhumation has come from his own relatives, who have repeatedly and vehemently expressed their desire to leave the poet where his killers dumped him.
Here, too, are the familiar grumblings about the inefficiency of printers, the usual unrealistic fantasies about circulation and the vehemently expressed regrets at ever having taken on such a doomed and life-destroying enterprise in the first place.
Dolan vehemently expressed his belief that Cablevision should make the offer, believing that Cablevision would end up paying YES little or nothing, according to several executives at the meeting.
Saint Paul's epistles owe their impact perhaps second to none in the history of the Western world to the self that vehemently expresses itself in them, showing no concern whatever for the niceties of Attic prose.
In the year of Black Lives Matter and politicians vehemently expressing the need for criminal justice reform, the legalization of cannabis will reduce the systematic incarceration of African Americans for marijuana possession.
Carlton Lee, Michael Brown, Sr.'s pastor and a friend of the family, vehemently expressed his support for the juror in question when VICE reached him in January.
Only a filmmaker like Werner Herzog could make a documentary about the internet and articulate the same existential angst he vehemently expressed over 30 years ago about nature.
Conversely, this year there've been several hip-hop artists, including T.I., YG and Nipsey Hussle, and a few kids from Baltimore that have very publicly (and vehemently) expressed their disdain for The Donald.
But the "disgust" was most vehemently expressed by those most contemptuous of the U.S. military -- Afghanistan officials -- and was by contrast even empathized with by some Americans, such as former Army lieutenant colonel, Rep. Allen West (R-FL), who responded to criticizers by saying "shut your mouth -- war is hell".
That has been talked about enough and fans are starting to express themselves vehemently on social media.
