unfounded
adj. Not based on fact or sound evidence; groundless: synonym: baseless.
Not founded; not built or established. Having no foundation; vain; idle; baseless: as, unfounded expectations.
adj. Not founded; not built or established.

So the curve didn't work and linear didn't work so we put them together and call them a linear curve, now that is brilliant it should do wonders.

I know something even more brilliant than that: we don't do anything and expect that things improve nonetheless. Flawless logic: we tried X and it didn't work, why try Y, clearly X didn't work why would Y, or Z, or X/Y.