Improv and On impulse

Improv noun - Something that is performed, made, or done without preparation.

On impulse and improv are semantically related in extemporaneous topic. In some cases you can use "On impulse" instead an adjective "Improv", when it comes to topics like unrehearsed, improvised.

Improv and on impulse are semantically related in extemporaneous topic. You can use "Improv" instead an adjective phrase "On impulse", if it concerns topics such as unrehearsed, improvised.