In a dull manner; without liveliness; without lustre.(adverb)
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Use "dully" in a sentence
"We walked past a hodgepodge of club debris — heavy dishes stacked on a bar that receded into darkness, stuffed moose heads gazing dully from a reading-room floor — and climbed rickety stairs to the fifth floor."
"He repeated the word dully, staring almost stupidly at the speaker."
"“Cathy Summers,” said Cathy, and I registered the last name dully in my head, crossing my arms and pressing my lips together as hard as I could."