Whizbangs, often used to describe something as being impressive or flashy, can have several antonyms depending on the context. Some possible antonyms include unspectacular, unimpressive, mundane, plain, ordinary, and boring. While whizbangs might capture attention or be attention-grabbing, their opposites lack any sort of excitement or extravagance. A product or service might be described as being unremarkable or basic - the antithesis of being "whizbang". In general, the antonym for whizbangs would be anything that is banal, commonplace, or unimpressive. Regardless of the antonym used, it is clear that the term whizbang implies a positive connotation, and any opposite term would be negative.