[en] For the long standing low mass puzzle of Λ${}_c$(2940)${}^{+}$, we propose an unquenched picture. Our calculation explicitly shows that the mass of the Λ${}_c$(2P,3/2${}^{-<!--\; ???\; -->}$) state can be lowered down to be consistent with the experimental data of Λ${}_c$(2940)${}^{+}$ by introducing the D${}^{\ast <!--\; ???\; -->}$N channel contribution. It means that the low mass puzzle of Λ${}_c$(2940)${}^{+}$ can be solved. What is more important is that we predict a mass inversion relation for the 2P Λ${}_c^{+}$ states, i.e., the Λ${}_c$(2P,1/2${}^{-<!--\; ???\; -->}$) state is higher than the Λ${}_c$(2P,3/2${}^{-<!--\; ???\; -->}$), which is totally different from the result of conventional quenched quark model. It provides a criterion to test such an unquenched scenario for Λ${}_c$(2940)${}^{+}$. We expect the future experimental progress from the LHCb and Belle II.