The phrase "a fierce hostility" is correct and usable in written English.
It can be used to describe a strong and intense feeling of animosity or opposition towards someone or something.
Example: "The two rival factions displayed a fierce hostility towards each other, making negotiations nearly impossible."
Alternatives: "an intense animosity" or "a strong antagonism".
One Connolly trait shared by top players today is a fierce hostility on the court, said Steve Flink, a tennis analyst and historian.
With its barely functional government and a fierce hostility to foreign armies since the hasty American withdrawal from Mogadishu in the early 1990s, Somalia is a country where Western militaries have long feared to tread.
Similarly, his militant commitment to the proletariat — he proclaimed his allegiance to the Italian Communist Party in 1947 — coexists with a fierce hostility to modernity, and a suspicion of the idea of historical progress.
But none call for a radical rethinking of Europe's direction as demanded by euroskeptics, who are united by a fierce hostility to any further surrender of sovereign powers to Brussels and mostly want Brussels to roll back its political ambitions and focus exclusively on facilitating free trade.
French physicist Bernard d'Espagnat, who was awarded the prestigious Templeton Prize in 2009, offers a contrast to Harris' fierce hostility toward religion.
The government is in no position to refuse, and besides, the massive stimulus of hundreds of millions of Australian dollars, and jobs for an under-employed workforce, outweighs the fierce hostility that many – not all – in the Nauruan community hold for the refugees imposed upon their island.
It's about our ancestors leaving that country, often in bitter circumstances, and risking everything on a hazardous journey and being met with fierce hostility and scorn.
Rome's enmity was partly a reaction to the doctor's own fierce hostility to religion, including his infamous denigration of faith in God as an infantile father projection.
There is fierce hostility outside to the new regime, and to the new Parliament.
The comic's fierce hostility to organised political parties has even been compared to Mussolini's attacks on parliamentary democracy.
There and elsewhere, sectarian hatred seems to be on the rise, with protesters expressing increasingly fierce hostility to the Alawites, in particular.
