IPA: /ˌæn.tɪ.klaɪˈmæk.tɪk/
KK: /æntɪklaɪˈmæktɪk/
Describing a situation that is disappointing or less exciting than expected, especially after a build-up of excitement or anticipation.
The movie had an anticlimactic ending that left the audience feeling unsatisfied.
Anticlimactic is formed from "anti-" (meaning against) and "climax" (from Greek "klimax", meaning ladder or the highest point). The word describes a situation that goes against the expected high point or peak, resulting in a disappointing outcome.
Think of 'against' ('anti-') the 'highest point' ('climax') — that's why anticlimactic means something that disappointingly falls short of expectations.