anticlimactic

/ˌæntiklaɪˈmæktɪk/

Other forms: anticlimactically

When something seems like it's going to be exciting but then it lets you down, that's anticlimactic. An anticlimactic fireworks display would be brief and boring, with subdued pops of muted sparkles.

The Greek root of anticlimactic means "down a ladder," and that's exactly how it feels to experience something anticlimactic, as if you expected to go higher but you're suddenly near the bottom of the ladder. In a scary movie, as the hero moves closer to the creepy basement door while terrifying music plays, it will be a bit anticlimactic if the door swings open to reveal a mewing kitten.

Definitions of anticlimactic

1. adjective

   of or relating to a sudden change from an impressive to a ludicrous style
   synonyms: anticlimactical
2. adjective

   coming after the climax especially of a dramatic or narrative plot
   “everything after the discovery of the murderer was anticlimactic”

   antonyms:

   climactic

   consisting of or causing a climax