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Adjective: wearisome  weer-i-sum
  1. So lacking in interest as to cause mental weariness
    "other people's dreams are dreadfully wearisome";
    - boring, deadening, dull, ho-hum [informal], irksome, slow, tedious, tiresome, deadly [informal], unamusing, draggy [informal], mind-numbing

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