The phrase "a really demanding" is correct and usable in written English.
It can be used to describe something that requires a lot of effort, attention, or skill, often in a challenging context.
Example: "The project turned out to be a really demanding task that tested everyone's abilities."
Alternatives: "a highly challenging" or "an extremely taxing".
"If you have a very addictive, very dominant, very demanding thing like Facebook, it's kind of like having a really demanding girlfriend or wife," Mr. Ito said.
An ability to do lots of reasonably interesting things while also obtaining a decent degree result is a good indicator of someone who's relatively well-organised and can handle stress – key qualities for a corporate lawyer, which, to reemphasise, can be a really demanding job requiring sometimes extremely long hours.
glass is a really demanding, unforgiving, and kinda dangerous process..
I haven't started overclocking the CPU yet, but already it's a joy to use – fast and responsive in demanding apps such as Photoshop, and I'm looking forward to trying a really demanding game.
In fact EAS seems to be a really demanding and grounded case-study for the referred research communities.
BERNARD TELSEY Nowadays you have theater owners really demanding a name actor in a production because then it sounds like a sure bet as far as a rental.
When people inveigh against the lack of personal responsibility in health care, they are really demanding a different model, one based on actual risk, not just on spreading costs evenly through society.
Too often such calls are really demanding a curriculum filled with rigor mortis.
It was that I wanted to get across what it's like to work on the Internet in a job that's really demanding.
What India is really demanding is an end to Pakistani support, official and private, for fighters who infiltrate across the border or receive funds and arms from Pakistan.
"None of our tenants were really demanding it at the time," said Brian Mahoney, a company spokesman.
