dullness

Noun
  1. The quality of being slow to understand (synset 105653884)
  2. The quality of lacking interestingness (synset 105213007)
    "the stories were of a dullness to bring a buffalo to its knees"
  3. A lack of visual brightness (synset 104962810)
    "the brightness of the orange sky was reflected in the dullness of the orange sea"
  4. Lack of sensibility (synset 104852122)
    "there was a dullness in his heart"; "without him the dullness of her life crept into her work no matter how she tried to compartmentalize it."
  5. Without sharpness or clearness of edge or point (synset 104713019)
    "the dullness of the pencil made his writing illegible"

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