The change from antiferromagnetism induced ferroelectricity to spin glass ferroelectric relaxor has been studied along the CuCr1−xVxO2 (0≤x≤0.5) solid solution of polycrystalline samples. As x increases from CuCrO2 (x=0) to CuCr0.82V0.18O2, it is found that the Néel temperature decreases from ∼24 K down to ∼13 K. This progressive weakening of the antiferromagnetism of CuCrO2 induces a rapid decrease of the spin induced ferroelectricity with polarization values going from ∼44 μC/m2 down to ∼1.5 μC/m2 for x=0.04 and x=0.08, respectively. Beyond x=0.18 (0.20≤x≤0.50), ac-magnetic susceptibility and magnetization measurements evidence a spin glass state while dielectric permittivity and polarization measurements point towards a relaxor behaviour. This shows that competing magnetic interactions in delafossites are an efficient way to transform a spin induced magnetoelectric into a multiglass (spin and dipolar) state.