Laggard and Unenergetic

Laggard adjective - Moving or proceeding at less than the normal, desirable, or required speed.

Unenergetic and laggard are semantically related In some cases you can use "Unenergetic" instead an adjective "Laggard".

Unenergetic adjective - Deficient in alertness or activity.

Laggard and unenergetic are semantically related in inactive topic. Sometimes you can use "Laggard" instead an adjective "Unenergetic", if it concerns topics such as lazy.