noun
long-winded speech; tedious lecture; long boring talk
Refers to a speech, explanation, or lecture that is overly long and tiresome. Often used critically or humorously.
彼の長談義にはいつも辟易する。
I'm always fed up with his long-winded speeches.
会議で部長が長談義を始めて、みんなうんざりした。
At the meeting, the department head launched into a tedious lecture, and everyone got bored.
Compound of 長 (long) and 談義 (discourse, lecture). 談義 itself derives from a Buddhist term for a sermon or explanation of doctrine, later extended to mean any lengthy talk.