The phrase "a far more onerous" is correct and usable in written English.
It can be used to describe something that is significantly more burdensome or difficult than another thing.
Example: "The new regulations are a far more onerous requirement for small businesses compared to the previous ones."
Alternatives: "much more burdensome" or "considerably more taxing".
In 1956, the International Business Machines Corporation agreed to a far more onerous and sweeping consent decree.
But Microsoft notes that AT&T labored under a far more onerous regulation previously, prohibiting the unified company from branching into new businesses not related to telephony.
Either woman could have still brought a claim for co-worker harassment, but the case would almost certainly be dismissed because a far more onerous legal standard would apply – and their employers could escape liability by stating that they had no way of knowing about the offending conduct.
While the Bush administration has slogged toward preparing to ask for a license to open a waste repository at Yucca Mountain, the 20-year-old law under which it is looking to open a site has a far more onerous task.
On mobile, without the benefit of a mouse and a keyboard, it's far more onerous to select objects and input information than it is on desktop.
But the Swift provision in the new legislation, which some advocates of sanctions have described as a silver bullet, could be far more onerous.
The only avenue left to us is the far more onerous one of a challenge at the federal court.
The public seems to agree with Mr. Bush's assertion that there are great complexities in battling terrorism and that a military campaign would be protracted, and probably far more onerous than those in the past.
Inspections to confirm that North Korea had shut down its nuclear program and secure its arms would be far more onerous than those in Iran under a current deal that President Trump wants to end.
In reality, it's been shown that a majority of black borrowers, who qualified for conventional, fixed-rate long-term mortgages were steered to volatile, subprime loans instead; that presented with a white and a black borrower with matching qualifications, routinely the blacks got loans with far more onerous terms for repayment.
A sobering note came from some religious leaders, who stood to warn colleagues that it was far more onerous to get money from the government than from a church board.
