  We show that adjoint QCD features very strong Bose-Fermi cancellations in the
large $N$ limit, despite the fact that it is manifestly non-supersymmetric. The
difference between the bosonic and fermionic densities of states in large $N$
adjoint QCD turns out to have a `two-dimensional' scaling $\sim
\exp{(\sqrt{\ell E})}$ for large energies $E$ in finite spatial volume, where
$\ell$ is a length scale associated with the curvature of the spatial manifold.
In particular, all Hagedorn growth cancels, and so does the growth
$\exp{(V^{1/4} E^{3/4})}$ expected in a standard local 4d theory in spatial
volume $V$. In these ways, large $N$ adjoint QCD, a manifestly
non-supersymmetric theory, acts similarly to supersymmetric theories. We also
show that at large $N$, the vacuum energy of multi-flavor adjoint QCD is
non-negative and exponentially small compared to the UV cutoff with several
natural regulators.
