Answer:

droned

Answer	Crossword Clue
DRONED	Went on and on and on
DRONED	Talked monotonously, with "on"
DRONED	Spoke in a monotone

DRONED	Hummed
DRONED	Buzzed
DRONED	Talked on and on and on . . .
DRONED	Hummed dully
DRONED	Talked in a monotone
DRONED	Used no modulation
DRONED	Hummed.
DRONED	Hummed, as bees.

DRONED	Spoke monotonously.
DRONED	Went on monotonously.
DRONED	Made a buzzing sound.
DRONED	Buzzed.
DRONED	Talked, in a way.
DRONED	Spoke monotonously
DRONED	Uttered in a monotone
DRONED	Wasn't colorful

DRONED	Used no inflection, maybe
DRONED	Went on and on and ...
DRONED	Spoke so as to put people to sleep
DRONED	Played the bagpipes
DRONED	Talked in a monotonous tone
DRONED	Went on and on ...
DRONED	Talked monotonously
DRONED	Bored an audience

DRONED	Abandoned inflection