anticlimactic
1. [ adjective ] of or relating to a sudden change from an impressive to a ludicrous style
Synonyms: anticlimactical
Related terms: anticlimax anticlimax
2. [ adjective ] manifesting or attended by a disappointing or ineffective conclusion
Examples:

"everything after the discovery of the murderer was anticlimactic"

Related terms: climactic falling
Similar spelling:   anticlimactical
  anticlimax
  anticlinal
  Antichrist