longsome

/ˈlɔːŋsəm/
adjective
  1. Causing a feeling of weariness or boredom because of being too long or slow; tedious.
    • The longsome lecture on tax law made half the students fall asleep.
    • We sat through a longsome ceremony that lasted over three hours.
    • The hike became longsome as we trudged through miles of flat, empty desert.
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