The phrase "declared emphatically" is correct and can be used in written English
It means that something was stated or spoken with great emphasis or conviction. Example: The politician declared emphatically that she would not back down from her stance on immigration reform.
"I wouldn't move into a project even if they'd take me," Mrs. Espagnola declared emphatically.
"I don't think he had a heart attack," the patient's wife declared emphatically.
"People want to see sharks," Jack Passie, the captain of the charter boat Windy, which ties off at the Star Island Yacht Club, declared emphatically.
"There has been a lot of talk that Quins have been 'worked out', which is rubbish," he declared emphatically ahead of today's derby with Wasps at Twickenham.
"This is absolutely a panic in the public due to rumors and wide publicity given in the press," he declared emphatically.
Unlike his Salafist rivals, who are open about the need for religious figures to be moral guides in politics, Haïdara declared emphatically that "as long as we are alive we will resist" making the religious political.
"No," he declares, emphatically enough to prompt visible bafflement on my part.
The President broke his silence for the first time since the strike started by declaring emphatically that this is no time for statements.
But, recounting a horrific story of orangutan abuse – he is just back from Borneo, where he has been making a documentary – he will then declare emphatically that he hates people.
But I repeatedly discuss the church's acceptance and defense of Catholic converts (see Page 50, for example) and, trying to forestall the expected willful misreadings, I declare emphatically, "I am not equating the Catholic Church, as it is now or as it was during the Nazi period, with Nazi Germany".
The Labor leader intended to stare down the prime minister's warnings about a return to the Gillard government's carbon tax by declaring emphatically that "an ETS is not a tax" and Australia must not be a laggard on climate policy.
