Refutable
/rɪˈfjuːtəbl/
Definition 1 of 1
Pro Tip 1/3Challengeable Claims
Use 'refutable' to describe claims that you think can be challenged or disproved based on evidence. 
The lawyer described the witness's testimony as refutable.
Pro Tip 2/3Scientific Debates
'Refutable' is often used in scientific contexts where hypotheses must be testable and potentially disprovable. 
For a theory to be scientific, it must be refutable.
Pro Tip 3/3Persuasion Technique
Use 'refutable' to weaken an opponent's argument by suggesting it's not reliable or solid. 
Her argument is clearly refutable when you look at all the facts.