'fervently wish' is correct and usable in written English.
You can use it to express a strong feeling of hope or desire for something. For example, "I fervently wish for world peace."
Come to think of it, most of us fervently wish our perennial flowers would do the same thing.
'We fervently wish for their caper to succeed': the heist crew in Ken Loach's The Angels Sharee.
Do you fervently wish the world still gnashed its teeth as New York's pinstriped paragons strolled to yet another championship?
I FERVENTLY wish I were not the sort of person who needs to buy a product called Nature's Miracle Stain and Odor Remover.
And through it all, no, it isn't a village, really; nor is it metropolitan bohemia, though some of Mackay's flightier characters might fervently wish that it were.
If these Americans knew that we didn't have such laws — laws they so fervently wish to enforce — their beliefs about the correct course of Congressional action might be very different.
He so fervently wished it never happened.
It left me fervently wishing that Rickman would play Hamlet.
Trump's election victory is something Putin has fervently wished for, but scarcely thought possible.
Those who fervently wished to go to Palestine faced the British blockade.
By the time I'd grown out of Playaway, I fervently wished that Toni Arthur would, but really?
