Went (on) monotonously

• Hummed in a dull manner
• Talked on and on
• Sounded like bagpipes
• Talked monotonously
• Kept a sustained pitch
• Buzzed like a bee
• Talked someone to sleep, perhaps
• Spoke in a monotone

Wiktionary Word definitions in Wiktionary
vb. (en-past of: drone )

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Drone \Drone\ (dr[=o]n), v. i. [imp. & p. p. Droned ; p. pr. & vb. n. Droning .] [Cf. (for sense 1) D. dreunen, G. dr["o]hnen, Icel. drynja to roar, drynr a roaring, Sw. dr["o]na to bellow, drone, Dan. dr["o]ne, Goth. drunjus sound, Gr. ? dirge, ? to cry ...