Tending to exhaust, enfeeble, or drain the strength: as, exhausting labor.

adjective. Producing exhaustion.

adjective. Very tiring.

verb. Present participle of exhaust.

adjective. having a debilitating effect

adjective. producing exhaustion

"Plath may not have enjoyed what she described as an exhausting evening of burned popcorn and endless storybook reading, but at least she and her charges emerged relatively unscathed."

debilitating  effortful  

costing  defrosting  frosting  

arduous  burdensome  crippling  debilitating  devitalizing  

exhaust