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Adjective: irksome  urk-sum
  1. So lacking in interest as to cause mental weariness
    "what an irksome task the writing of long letters is";
    - boring, deadening, dull, ho-hum, slow, tedious, tiresome, wearisome, deadly, unamusing, draggy, mind-numbing

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