  We have studied the electrodynamic response of strongly disordered
superconducting TiN films using microwave resonators, where the disordered
superconductor is the resonating element in a high- quality superconducting
environment of NbTiN. We describe the response assuming an effective
pair-breaking mechanism modifying the density of states, and compare this to
local tunnelling spectra obtained using scanning tunnelling spectroscopy. For
the least disordered film (kFl = 8.7, Rs = 13 {\Omega}), we find good
agreement, whereas for the most disordered film (kFl = 0.82, Rs = 4.3
k{\Omega}), there is a strong discrepancy, which signals the breakdown of a
model based on uniform properties.
