provable
No names are mentioned, and such stories are unprovable.
Some of the charges are true, some unproven and probably unprovable, and others probably wrong.
These kind of conspiracy theorists are all too willing to spread unprovable allegations.
The claims that had been made about them were checked out and found either to be untrue or unprovable.

SMART Vocabulary: related words and phrases

Proving and disproving
acid test
actions speak louder than wordsidiom
anti-sexist
attest
authenticate
demonstrable
demonstrably
demonstration of something
dispel
disprove
non-documentary
non-evidence
probatory
proof positive
provability
verify
vindicate
vindication
vindicative
vindicatory