Spontaneous Speech

noun a spontaneous or improvised speech or performance

verb to speak or perform without preparation

• The actor was able to ad lib his lines flawlessly during the live performance.
• She had to ad lib a response when asked a question she wasn't prepared for.
• I love watching comedians ad lib during their stand-up routines.
• Sometimes in life, you have to ad lib and make quick decisions on the spot.

verb to speak or perform without preparation; to improvise

• The speaker had to extemporize a speech when the teleprompter malfunctioned.
• I had to extemporize a story to cover up my mistake.
• He's so good at extemporizing, he could talk his way out of anything.
• Sometimes in life, you have to extemporize and go with the flow.

noun a performance or speech that is done without preparation

adjective done without being planned or rehearsed

• The impromptu meeting was called to address the urgent issue.
• We decided to have an impromptu picnic in the park.
• Let's make an impromptu trip to the beach!
• His impromptu decision to quit his job surprised everyone.