Dismissively is a word that refers to the act of disregarding, belittling or ignoring something or someone with a sense of disdain, scorn or contempt. When seeking alternatives, the term "condescendingly" could be considered as it suggests a similar tone that denotes superiority or superiority complex. Other terms may include "disdainfully," "patronizingly" or "contemptuously," all of which express a similar connotation and tone. Some synonyms which hold slightly different meanings include "indifferently," "cavalierly," "nonchalantly" or "apathetically." In summary, there are many words that can convey the sense of dismissiveness, each with its own nuance and context.