  We report cross-section measurements of the final-state muon kinematics for
\numu charged-current interactions in the NOvA near detector using an
accumulated 8.09$\times10^{20}$ protons-on-target (POT) in the NuMI beam. We
present the results as a double-differential cross section in the observed
outgoing muon energy and angle, as well as single-differential cross sections
in the derived neutrino energy, $E_\nu$, and square of the four-momentum
transfer, $Q^2$. We compare the results to inclusive cross-section predictions
from various neutrino event generators via $\chi^2$ calculations using a
covariance matrix that accounts for bin-to-bin correlations of systematic
uncertainties. These comparisons show a clear discrepancy between the data and
each of the tested predictions at forward muon angle and low $Q^2$, indicating
a missing suppression of the cross section in current neutrino-nucleus
scattering models.
