Answer:

dully

AnswerCrossword Clue
DULLYWithout enthusiasm
DULLYWithout verve
DULLYIn a boring manner
DULLYDispiritedly.
DULLYSluggishly.
DULLYIn a tedious manner.
DULLYObtusely.
DULLYSans spirit
DULLYWithout sparkle
DULLYIn a listless manner
DULLYIn a blah manner
DULLYWithout much intelligence
DULLYSluggishly
DULLYIn a listless way
DULLYSans sparkle