Ad-lib

 WORD OF THE DAY

ad-lib / verb /  ˈad-ˈlib 

Definition
1: to deliver spontaneously
2: to improvise especially lines or a speech
3: spoken, composed, or performed without preparation
4: in accordance with one's wishes
5: without restraint or limit

Examples
Another challenge is that audience members are called up on stage, to be additional spellers in the bee, which requires, per the script, the ability to ad lib.
— Steve Smith, courant.com, 21 Oct. 2021

With his perfect presentation left back home, Knapp is forced to ad lib.
— Michael Chavez, Forbes, 21 Sep. 2021

Did You Know?
Ad-lib is a shortening of Latin ad libitum, which means "in accordance with one's wishes."
In the past, ad libitum was used to refer to any activity where the performer was free to do whatever they liked for as long as desired, whether the activity be drawing, working math problems, talking, playing music, or acting.