The phrase "are not substantial enough" is correct and usable in written English.
It can be used to express that something lacks the necessary importance, significance, or amount.
Example: "The arguments presented in the debate are not substantial enough to convince the audience."
Alternatives: "are insufficient" or "lack sufficient weight".
They may have intellectual independence, and small grants from different foundations can help them achieve some financial independence, but it is still difficult to assemble a team because such grants are not substantial enough to pay postdoc, or even student, salaries.
However, these results are not substantial enough to be complete.
Nevertheless, the current study illustrated that as long as the course setting changes are not substantial enough, speed might not be reduced considerably, since racers are still able to adapt and partly compensate by changing their timing strategy.
But, according to Paul Rozin, of the University of Pennsylvania, who studies the psychology of taste, the salutary effects of chilis aren't substantial enough to account for their appeal to humans, the only mammals that eat them.
"There aren't substantial enough changes to get us where we need to be".
But, although a very entertaining 45 minutes, it's not substantial enough to seem essential.
The Kentucky Supreme Court concluded that the risk was not substantial enough to make the particular combination unconstitutional.
It may be that when your fathers say that the food in a particular restaurant is not substantial enough, they are really saying something else.
"But in the modern era those things don't apply: we have tried to find baddies but we all know that is not substantial enough".
The conference is getting an extreme makeover, Madison Avenue style, in reaction to complaints that the program last year was not substantial enough.
Mr. Cantor, the department's spokesman, said that credit recovery had existed for decades and that any abuse was not substantial enough to affect graduation rates.
