"fundamentally reasonable" is a correct and usable phrase in written English.
It can be used to describe something that is essentially or fundamentally logical, fair, or justified. Example: "Her argument was fundamentally reasonable, backed up by solid evidence and clear reasoning."
It is indeed important to make sure successful experimental conditions are fundamentally reasonable for early Earth.
Life is seen, not only in Jane Austen's novels but in the whole current of bourgeois Anglo-American fiction, as fundamentally reasonable and decent.
The material that the intelligence services provided was "fundamentally reasonable," he went on, but it had been presented "in a very black-and-white way".
I asked him what he meant by this, and he elaborated and he said he felt the essential quality of the intelligence provided by the intelligence services was fundamentally reasonable.
The categorical imperative impels us completely, without ifs, buts, ands, etc.; and it is fundamentally reasonable.
He insisted on a God who was fundamentally reasonable, and who could not be otherwise.
It is fundamentally fair.
"This America is fundamentally fair".
You've been a huge inspiration to me professionally, but you've also always struck me as fundamentally a fair and reasonable, level-headed person who cares deeply about humanity.
There might be inconsistencies in his record but Cookson, fundamentally, is a reasonable man.
No power elite can stop the people (which includes wage slaves in the police and the military) from asserting whatever threshold of organized people power to demand principled changes to an inherently unjust economic system to one based on fundamentally just and reasonable moral principles grounded on the inherent dignity and freedom of every person.
