ad-libbing
Definitions
The act of speaking or performing spontaneously without preparation or a script.
Improvising lines or actions during a performance to fill gaps or react to unexpected situations.
Examples
The comedian was famous for ad-libbing during his stand-up routines, often creating jokes on the spot.
The actor started ad-libbing when he forgot his lines, but the director decided to keep the improvised scene in the final cut.
Synonyms
improvising extemporizing winging it spontaneously speaking off-the-cuff speaking