drone

Someone who takes more time than necessary; someone who lags behind.

A pipe of the bagpipe that is tuned to produce a single continuous tone.

An aircraft without a pilot that is operated by remote control.

An unchanging intonation.

Stingless male bee in a colony of social bees (especially honeybees) whose sole function is to mate with the queen.

Talk in a monotonous voice.

Make a monotonous low dull sound.