It is shown that the electronic friction between a metallic surface and an open-shell atom or molecule moving perpendicularly to it can be substantially enhanced under experimentally interesting conditions due to the involvement of the Kondo or correlated mixed-valent state. The region of large friction is shifted from the point where the adsorbate resonance crosses the Fermi level to the point where the position-dependent Kondo temperature is of the order of the physical electron temperature. In addition, there is strong temperature and velocity dependence, along with the breakdown of the local friction approximation. Nevertheless, the strong frictions persist for reasonable experimental velocities.