  We study the relativistic quantum motion of a spineless particle using the
Feshbach-Villars (FV) formalism in the spinning cosmic string spacetime. The
movement equations are derived using the first-order FV formulation of the
Klein-Gordon (KG) equation. We apply the equation of motion (a) to study the
motion of the particle confined to a rigid-wall potential, (b) motion in the
presence of a Coulomb-type potential, and (c) particle interacting with the
Feshbach-Villars oscillator (FVO). The energy levels and wave functions are
obtained for the three cases. Our study focused on the impact of rotation and
curvature on the energy levels of the particle
