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Adjective: mind-numbing  'mInd,núm-ing
  1. So lacking in interest as to cause mental weariness
    "Eliminate mind-numbing, energy-sapping bureaucratic rules and regulations";
    - boring, deadening, dull, ho-hum, irksome, slow, tedious, tiresome, wearisome, deadly, unamusing, draggy

See also: lame, lameo [informal], meh [informal], samey [Brit], uninspiring, uninteresting