Everything that is not true is refutable leading to absurdity or contradiction. The way is to have a polemic methodology like Socrates, in which nothing is defended but seeks to lead to a contradiction in the results of the postulate.
It could indeed, if we analyze what it is to feel good, and what requirements are necessary, and then analyze if you meet those requirements and see if you really feel good today or just lie.
How do you refute an AXIOM?
Everything that is not true is refutable leading to absurdity or contradiction. The way is to have a polemic methodology like Socrates, in which nothing is defended but seeks to lead to a contradiction in the results of the postulate.
What about unfalsifiable claims?
For example, I claim to be feeling generally well today.
Can you determine if this is not true?
It could indeed, if we analyze what it is to feel good, and what requirements are necessary, and then analyze if you meet those requirements and see if you really feel good today or just lie.
I'm pretty certain you're unable to determine if I "felt generally well" today (or three days ago).
And the main reason you can't determine this is because it's not QUANTIFIABLE.
It's a fundamentally private experience.
If you were willing to share the information, in a hypothetical case, and I trust your testimony, there is no reason why we cannot determine it.
Sincerity =/= REAL-TRUE-FACT.
They are the same when talking about experience and not science. Unless you don't know what you experience.