drone
noun.
stingless male bee in a colony of social bees (especially honeybees) whose sole function is to mate with the queen
noun.
an unchanging intonation
Synonym: droning, monotone
noun.
someone who takes more time than necessary; someone who lags behind
Synonym: trailer, poke, lagger, laggard, dawdler
noun.
an aircraft without a pilot that is operated by remote control
Synonym: pilotless aircraft, radio-controlled aircraft
noun.
a pipe of the bagpipe that is tuned to produce a single continuous tone
Synonym: bourdon, drone pipe
verb.
make a monotonous low dull sound
The harmonium was droning on
verb.
talk in a monotonous voice
Synonym: drone on