Ad-libbed, also known as improvisation, is the act of speaking or acting in an impromptu or spontaneous manner. Synonyms for ad-libbed include extemporaneous, impromptu, unscripted, spontaneous, off-the-cuff, and unrehearsed. These terms all refer to the act of performing or speaking without prior preparation or planning. Each word implies a slightly different approach to ad-libbing. For example, "unrehearsed" indicates that the performer has not practiced beforehand, while "spontaneous" suggests a sudden inspiration or unconscious action. Regardless of the term used, ad-libbing adds spontaneity and energy to performances, keeping audiences engaged and entertained.