  Anisotropic scintillators can offer a unique possibility to exploit the
so-called directionality approach in order to investigate the presence of those
Dark Matter (DM) candidates inducing nuclear recoils. In fact, their use can
overcome the difficulty of detecting extremely short nuclear recoil traces. In
this paper we present recent measurements performed on the anisotropic response
of a ZnWO$_4$ crystal scintillator to nuclear recoils, in the framework of the
ADAMO project. The anisotropic features of the ZnWO$_4$ crystal scintillators
were initially measured with $\alpha$ particles; those results have been also
confirmed by the additional measurements presented here. The experimental
nuclear recoil data were obtained by using a neutron generator at ENEA-CASACCIA
and neutron detectors to tag the scattered neutrons; in particular, the
quenching factor values for nuclear recoils along different crystallographic
axes have been determined for three different neutron scattering angles (i.e.
nuclear recoils energies). From these measurements, the anisotropy of the light
response for nuclear recoils in the ZnWO$_4$ crystal scintillator has been
determined at 5.4 standard deviations.
