The phrase "a really fundamental" is correct and usable in written English.
It can be used to emphasize the importance or basic nature of something in a discussion or explanation.
Example: "Understanding the principles of mathematics is a really fundamental aspect of engineering."
Alternatives: "a truly essential" or "a very basic".
This is lifting the lid on a really fundamental difference in attitude towards women.
That's why Snyder's ideas are so exciting -- he's asking a really fundamental question, which no one has yet answered".
"I think one of the most obvious things about actors like Tatum and Evans is this basic idea that they don't seem to take themselves all that seriously, which is a really fundamental characteristic of anyone's longevity in any career choice," explained Fowles.
Last week for instance he argued "the Conservatives have got to ask themselves a really fundamental question – are they going to constantly run after Ukip, which I don't think is going impress anybody, and only has one destination, and is that they become interchangeable with Ukip.
But I think it is certainly difficult to see most of the 91 Conservative members [who rebelled over Lords reform], and a good many of those who spoke on the Labour benches against the bill on Monday and Tuesday last week, shifting their ground on what for many of them is a really fundamental obstacle.
Yes, and that's a really fundamental point.
And arguably it is that tactical decision, if that's what it was, that lies behind today's circus rather than any really fundamental difference between the "sides".
The bishop of Sheffield, the Rev. Steven Croft, said the government plans represented a "really, really fundamental change to an institution which has been at the core of our society for hundreds of years and which for the church is not a matter of social convention but of Christian doctrine and teaching".
Political wish lists easily result in new topics being lighted upon instead of there being a focus upon the really fundamental rights.
A placement exam channels those with "really fundamental issues of grammar and sentence construction" into a course in basic composition.
It speaks to a set of anxieties that seem really fundamental at the moment".
