anticlimax
1. [ noun ] a disappointing decline after ad previous rise
Examples:

: "the anticlimax of a brilliant career"

Related terms: fall
2. [ noun ] (fine art,writing) a change from a serious subject to a disappointing one
Synonyms: bathos
Related terms: conclusion story
Similar spelling:   anticlimactic
  anticlinal
  antiacid
  antigenic
  Antichrist
  anticancer