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The phrase "are undoubtedly sufficient" is correct and usable in written English.
It can be used to express certainty about the adequacy or sufficiency of something in a particular context.
Example: "The resources we have gathered for the project are undoubtedly sufficient to meet our goals."
Alternatives: "are certainly adequate" or "are clearly enough".
Dictionary
are undoubtedly sufficient
adverb
Without doubt.
Exact(1)
The words with which Justice Jackson concluded his apologia in McGrath v. Kristensen are undoubtedly sufficient: "If there are other ways of gracefully and good-naturedly surrendering former views to a better considered position, I invoke them all".
Similar(59)
Interventions focused on poverty are undoubtedly useful, but not sufficient.
The accumulation of these mutations are undoubtedly essential to cancer initiation, however they do not appear to be sufficient for the clinical progresson of most epithelial cancers.
Rankings are undoubtedly seductive.
Some are undoubtedly the unskilled.
Both statements are undoubtedly true.
Therefore, they are undoubtedly benign molecules.
These factors are undoubtedly important.
(There are undoubtedly other, undetected errors).
There are undoubtedly challenges in the future.
There are undoubtedly talks about abortion.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com