Hypothesis
Perhaps you mean "conjectural" which means based on supposition, conjecture, or just plain guesswork.
It is a proposition or a belief that has not yet been proven.
Will conjecture.
a conjecture
Conjecture is a noun.
The Poincaré Conjecture.
A conjecture should be testable. You test it and if it fails the test, it is a false conjecture.
One possible conjecture is that their sum is 27. The conjecture is patently false, but that does not stop it being a conjecture.
prefix COM , CON ..... complacent , companion , complicated , conjecture
My conjecture is that the sum is 67. A conjecture does not have to be true, or even plausible. You should be able to test it. If it is found to be true then in is no longer a conjecture, if it is found to be false, it is rejected - and so no longer a conjecture. If it cannot be proved either way, it remains a conjecture.
A conjecture is a guess, theory, hypothesis, or proposition.