I believe a true nihilist would simply behave in a sort of catatonic state. The idea being that the foundation of behavior is based in the concept: nothing is preferable to anything. Thus life is not preferable to death, etc. There is no motive to drive an individual. This would result in a sort of characteristic inertia of the true nihilist (or how I conceive of the ideal) where no force is applied to the system, thus no acceleration. Pardon my physics reference. Yet the world is random and any perceived reason is simply a human device, so in a way we’re all nihilists. We behave as the universe propels us. How would you recognize a true nihilist?