mind-numbing

/M AY1 N D N AH0 M IH0 NG/
adjective
  1. 1

    Excessively boring, tedious, or dull; repetitive; of an activity, etc., lacking any interest or variety that might serve as intellectual stimulation.

    After hours of mind-numbing work sorting hundreds of nearly identical form, he needed to stop and do something else.

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Source: https://en.wiktionary.org/wiki/mind-numbing