Abstract: We report the analysis of simultaneous XMM-Newton+Nuclear Spectroscopic Telescope Array (NuSTAR) observations of two low-luminosity active galactic nuclei (LLAGNs), NGC?3998 and NGC?4579. We do not detect any significant variability in either source over the ~3 day length of the NuSTAR observations. The broadband 0.5–60 keV spectrum of NGC?3998 is best fit with a cutoff power law, while the one for NGC?4579 is best fit with a combination of a hot thermal plasma model, a power law, and a blend…