HARANGUE

to deliver a pompous speech or tirade; a long pompous speech

a loud bombastic declamation expressed with strong emotion
SYN - rant

"It was in the middle of this harangue that his belt buckle broke and his pants fell down - a most pleasing break for the subject of his rant."

"He had harangued about this topic numerous times before and now he seemed to show indifference to it - leaving people to wonder just what he was told in his visit to the white house."

"This long-winded harangue against the government was eaten up by the easily persuaded crowd."