  We examine the stability of minimal dark matter (MDM) particle-candidates in
the setup in which they participate in radiative neutrino (R\nu) masses. We
first point out the existence of an additional renormalizable term in recently
proposed R\nuMDM Lagrangian, which violates the claimed accidental Z_2 symmetry
and spoils the stability of the fermionic MDM quintuplet component. We then
explore the viability of R$\nu$MDM variants based on scalar MDM multiplets.
There are ubiquitous super-renormalizable terms in the scalar potential which
make these scalar multiplets unstable.
