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"