Off the cuff is a common expression used to describe something that is improvised or unprepared. However, there are several synonyms for the phrase that can be used interchangeably, including impromptu, extemporaneous, ad-lib, and spontaneous. All of these terms refer to words or actions that are made up on the spot, without any prior planning or rehearsal. Other alternatives to off the cuff include on-the-spot, spur-of-the-moment, unrehearsed, and unscripted. These words can be used to describe anything from a speech to a joke, and are ideal for situations where a lack of preparation is valued or necessary.