The phrase "are truly sufficient" is correct and usable in written English.
You can use it when affirming that something meets the necessary requirements or standards.
Example: "The resources provided for the project are truly sufficient to meet our goals."
Alternatives: "are genuinely adequate" or "are really enough."
Moreover, the starting spectrum (a sampled ideal lowpass-filter frequency response) has zeros on the unit circle, so there is no sampling density that is truly sufficient in the frequency domain (no sufficiently long FFT in the time domain).
No amount of governance in the form of committees, regulators, trusts or advisory bodies is truly sufficient as a guarantor of independence.
However, it might also be worth questioning whether boredom is truly sufficient for meaninglessness.
Since those resources are truly "public," no one has sufficient interest in maintaining their cleanliness.
Instead of deciding what to get rid of, she says, the focus should be on what to keep: which few things spark sufficient joy or are truly necessary.
Banks then may need to engage in massive "fire sale" of their assets to pay their debts, and even that might not be sufficient if they are truly insolvent.
And sometimes less-altruistic or inward looking motivations can create other problems which may ultimately prevent a person being truly self sufficient.
Articles and commentaries are published with sufficient speed to ensure that they are truly current.
Large-scale studies will be required to provide sufficient statistical power to convincingly test whether such variants are truly NTD susceptibility factors (56, 103).
And there is no way you will have the sufficient gumption necessary to overcome the inevitable problems you are going to face, unless you are truly committed.
