Perform without preparation is a term used to describe the act of performing without any prior preparation. IMPROVISE, adlib, and wingit are all terms used to describe this concept. IMPROVISE is a nine letter word meaning to compose or perform something spontaneously without preparation. Adlib is a five letter word meaning to speak or perform without prior preparation. Wingit is a six letter word meaning to do something without planning or preparation. All three words refer to the same concept of performing without any prior preparation.