dul·ly /ˈdəlɪ/ 副詞
  Dul·ly adv. In a dull manner; stupidly; slowly; sluggishly; without life or spirit.
     Supinely calm and dully innocent.   -- G. Lyttelton.
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  dully
       adv 1: without liveliness; "she nodded her head dully"
       2: without luster or shine; "the light shone dully through the
          haze"; "unpolished buttons glinted dully"