Anticlimactic means disappointing after everything that built up to it. An anticlimactic ending, rather anticlimactic, anticlimactic in the end.
It describes the gap between expectation and event rather than the event itself, so a perfectly good outcome can be anticlimactic. It is a different word from anticlimatic, which is not a word at all.
1adjectiveanticlimacticDisappointing after everything that built up to it.
“After all the excitement of the build-up, the final match was a bit anticlimactic.”
anticlimactic is a quality.
From anti- + climactic.
Etymology from Wiktionary, CC BY-SA