1) Abandoned inflection 2) Bored an audience 3) Buzzed 4) Buzzed like a bee 5) Generated buzz 6) Hummed 7) Hummed in a dull manner 8) Intoned endlessly 9) Made a buzzing sound 10) Made a sustained hum 11) Played the bagpipes 12) Sounded like a didgeridoo 13) Sounded like bagpipes 14) Spoke in a monotone 1) Hummed 
• (imp. & p. p.) of Drone