waste of time

:  a sparsely settled or barren region :  desert

:  uncultivated land

:  a broad and empty expanse (as of water)

:  to lay waste

:  to damage or destroy gradually and progressively

:  to cause to shrink in physical bulk or strength :  emaciate, enfeeble

:  being wild and uninhabited :  desolate

:  arid, empty

:  not cultivated :  not productive

:  the measured or measurable period during which an action, process, or condition exists or continues :  duration

:  a nonspatial continuum that is measured in terms of events which succeed one another from past through present to future

:  leisure

:  to arrange or set the time of :  schedule

:  to regulate (a watch) to keep correct time

:  to set the tempo, speed, or duration of

:  of or relating to time

:  recording time

:  timed to ignite or explode at a specific moment