Anticlimactically is an adverb used to describe a situation that turns out to be disappointing or underwhelming. There are several synonyms that can be used interchangeably with this word to express the same meaning. Some of these related terms are unsatisfyingly, unremarkably, unexpectedly and lacklusterly. Other words such as uneventfully, flatly, abruptly and unimpressively can be used to describe events that fail to meet expectations, either abruptly or predictably. These words are useful when describing situations where there is a lack of excitement or where things just don't go as planned. Ultimately, the choice of synonym depends on the context in which it is used and the tone that the writer wishes to convey.