drone

1a :  to make a sustained deep murmuring, humming, or buzzing sound droning bees The air conditioner droned.b :  to talk in a persistently dull or monotonous tone droning on and on about his health

2 :  to pass, proceed, or act in a dull, drowsy, or indifferent manner The afternoon droned on.

1 :  to utter or pronounce with a drone

2 :  to pass or spend in dull or monotonous activity or in idleness droning the years away

1 :  a deep sustained or monotonous sound :  hum the drone of the motor

2 music :  an instrument or part of an instrument (such as one of the fixed-pitch pipes of a bagpipe) that sounds a continuous unvarying tone

3 music :  pedal point

:  a male bee

:  to make or to speak with a low dull tone or hum The speaker droned on and on.

:  a low dull tone or hum