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Adjective: unamusing  ,ún-u'myoo-zing
  1. Not funny; especially failing to achieve the intended humour
    "a very unamusing joke";
    - unfunny
  2. So lacking in interest as to cause mental weariness
    - boring, deadening, dull, ho-hum [informal], irksome, slow, tedious, tiresome, wearisome, deadly [informal], draggy [informal], mind-numbing

See also: humorless [US], humourless [Brit, Cdn], lame, lameo [informal], meh [informal], samey [Brit, informal], unhumorous, uninspiring, uninteresting