A surface lattice dynamics study of the effects of the coupling of vibrational modes with energies in the energy range of the bulk phonon band to a substrate lattice is presented. As illustrative examples the frustrated translational and rotational modes of a single adsorbed CO molecule on the (111) surface of Ni and Pt have been chosen. The results show that the coupling is weak for modes with energies below the zone boundary surface phonons and is well described by an elastic treatment of the substrate. Whereas modes with higher energies mix strongly with some of the zone boundary surface phonons accompanied with large broadenings and shifts from the mode energy in the rigid lattice situation. The corresponding strong satellite structures caused by this mixing could possibly be observed by vibrational spectroscopy like inelastic He scattering. Furthermore, the broadening and the shift in the elastic limit of the central nearest neighboring force constant model are compared with the results from an isotropic continuum model.