"in a dull manner, stupidly," early 15c., from dull (adj.) + -ly (2).
she nodded her head dully
unpolished buttons glinted dully
the light shone dully through the haze
dulcimer
Dulcinea
dull
dullard
dullsville
dully
Duluth
duly
duma
dumb
dumb-ass
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