Whirlwindy is a word often used to describe a state or an event that is characterized by a lot of frenzied activity or rapid changes. Synonyms for whirlwindy include frenetic, hectic, bustling, lively, and hectic. Frenetic connotes an almost uncontrollable level of movement or activity, while bustling suggests a lot of activity in a more organized and purposeful way. Lively indicates a sense of high energy, but not necessarily chaos, while hectic implies a sense of being overburdened with too many things to do. Any of these synonyms can be used to describe a whirlwindy situation, depending on the nuances and connotations that the writer wishes to convey.