Viscous force is somewhat like friction as it opposes, the motion and is non-conservative but not exactly so, because.

Is viscous force non-conservative?

Electrostatic force, gravitational force and spring force are the conservative forces because the workdone by these forces is path independent whereas viscous force is a non-conservative force as the work done by this force is path dependent.

Is viscous drag conservative?

Whereas the human push and the viscous drag are classified as non - conservative force .