долдо́нить

verb, imperfective

Very rarely used word (top 30,000)

to drone, to keep repeating, to harp on, to parrot
Example:
Он целый день долдо́нил одно и то же.
He's been droning on about the same thing all day.

Conjugation

Imperative
ты	долдо́нь
вы	долдо́ньте

Active present	долдо́нящий	harping, droning, tediously repeating, insisting persistently
Active past	долдо́нивший	droning, harping on, repeating monotonously
Passive present	долдонимый	droned, monotonously repeated, tediously repeated
Passive past	долдоненный	droned, harped on, reiterated monotonously, drilled (into someone's head)
Gerund present	долдо́ня	while doing (present)
Gerund past	долдонив долдонивши	while doing (past)