in Latin "not".
Transitive Verb - To make up something without preparation.
"Surprised by the nomination, she had to 'improvise' her acceptance speech.
Transitive Verb - To make or provide from materials on hand.
"The shipwrecked crew 'improvided; a boat from barrel staves."
Noun - improvisation; Adjective - improvisational; Adjective - Adjective - improvisatory.