The phrase "increasingly onerous" is correct and commonly used in written English.
You can use it when describing a task or situation that is becoming more and more difficult or burdensome. Example: "As the company expanded, the CEO found himself facing increasingly onerous responsibilities."
But banks face increasingly onerous regulations.
Mr. McConnell faces an increasingly onerous math problem.
"Adam imposes many strictures, which are increasingly onerous for mother," King wrote.
But manufacturers say that the demands have become increasingly onerous, and differ from store to store.
Younger workers will demand cuts in increasingly onerous taxes.Tensions are also likely between countries in the European Union.
Despite homework's increasingly onerous reputation, American students desperately need to keep pace with a competitive, interconnected global community.
At the state level in the U.S., attorneys general continue to investigate companies in the aftermath of significant data breaches, and regulators like New York's Department of Financial Services have adopted increasingly prescriptive and onerous regulations.
Suspending accounts for terms of service violations is a common punishment for many digital businesses, but in the age of massive conglomeration, it's increasingly leading to onerous punishment for only minor infractions.
Even before the middle of March, when Russia annexed Crimea, Pinxter's Ukrainian operation was becoming onerous and increasingly costly to run.
'Regime shopping', by which multinational enterprises move to countries with less onerous regulatory regimes, increasingly constrains governments and national economic policy (Streeck, 1992).
Breast cancer in women is increasingly frequent, and care is complex, onerous and expensive, all of which lend urgency to improvements in care.
