irrational

Often Strong Enough to Sweep the Will Away Entirely by Nathan Jones

It is dangerous to ignore the existence of the irrational. The more cultivated a person is, the more intelligent, the more repressed, then the more he needs some method of channeling the primitive impulses he’s worked so hard to subdue. Otherwise those powerful old forces will mass and strengthen until they are violent enough to break free, more violent for the delay, often strong enough to sweep the will away entirely.
— Prof. Julian Morrow in The Secret History (1992) by Donna Tartt