The phrase "a relentless battle" is correct and usable in written English.
It can be used to describe a continuous and unyielding struggle or conflict, whether literal or metaphorical.
Example: "The team faced a relentless battle against the clock to complete the project on time."
Alternatives: "an unyielding struggle" or "a ceaseless fight."
Are we doomed, he wondered, to a relentless battle against death in which "nothing will ever count as success"?
The pair will say they are committed to a "relentless" battle against terrorism and announce a joint £1.5bn investment in the development of drones.
Blandings Castle, in reality Florence Court, a mid-18th century stately home in County Fermanagh, described by Andrews as "dysfunction junction", is the scene of a relentless battle between Lord Emsworth, known as Clarence, and his sister.
Mr. Ware, who ran for mayor as an independent, and his backers have waged a relentless battle since the vote, arguing that Mr. DuPree benefited from invalid absentee ballots and pervasive election fraud.
Prices rise, and those with deep pockets seek to outdo each other by searching for the most exotic landscape, a relentless battle for position that is bound to leave almost everyone disappointed.
In the Algerian Sahara thousands are waging a relentless battle against the technology, and their arguments about wasting water are resonating loudly in California as well, where governor Jerry Brown is under intense pressure as his state's record drought deepens.
"Serpico" (1973), based on a book by Peter Maas, stars Al Pacino as Frank Serpico, who began as an idealistic police recruit and became a relentless battler against police corruption.
Life on the front lines of the opioid epidemic is an intimate, relentless battle.
By Margaret Talbot October 23, 2017 Life on the front lines of the opioid epidemic is an intimate, relentless battle.
BESIDE the riotous, relentless battle over Obamacare, a more tempered debate over health has been underway.
But, I'm here and I'm getting ready to face another relentless battle for my life a second time.
