Etymology
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dully (adv.)

"in a dull manner, stupidly," early 15c., from dull (adj.) + -ly (2).

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Definitions of dully

dully (adv.)
without liveliness;
she nodded her head dully
dully (adv.)
without luster or shine;
unpolished buttons glinted dully
the light shone dully through the haze
From wordnet.princeton.edu