adverb taking the 'to' particle
tediously; long-windedly; wordily
Describes speaking or writing in a rambling, repetitive, or overly detailed manner that feels tiresome. Often used with verbs like 話す or 書く.
彼は自分の失敗についてくだくだと話し続けた。
He went on and on tediously about his mistake.
説明がくだくだしていて、要点がわからなかった。
The explanation was so long-winded that I couldn't grasp the main point.