Anticlimax

n.

1.

(Rhet.) A sentence in which the ideas fall, or become less important and striking, at the close; - the opposite of climax. It produces a ridiculous effect. Next comes Dalhousie, the great god of war, Lieutenant-colonel to the Earl of Mar.

Noun	1.	anticlimax - a disappointing decline after ad previous rise; "the anticlimax of a brilliant career"
	2.	anticlimax - a change from a serious subject to a disappointing one Synonyms: bathos

downfall, fall