taskmaster - Wiktionary, the free dictionary

From Wiktionary, the free dictionary

From task +‎ master.

taskmaster (plural taskmasters)

  1. Someone who supervises workers, especially one who imposes hard or burdensome work.
  2. (figuratively) A source of hard work or responsibility.
    • 2023 June 4, Charles Hugh Smith, What Happens When the Competent Opt Out?[1]:

      It all looked so easy when the competent were at the helm, but reality is a cruel taskmaster, and all the excuses that worked as an underling wear thin once the incompetent are in leadership roles.