Ongoing and Unbroken

Ongoing adjective - Being in progress or development.

Unbroken is a synonym for ongoing in continuous topic. In some cases you can use "Unbroken" instead an adjective "Ongoing", when it comes to topics like perpetual, continual.

Unbroken adjective - Going on and on without any interruptions.

Ongoing is a synonym for unbroken in uninterrupted topic. You can use "Ongoing" instead an adjective "Unbroken", if it concerns topics such as continuous, perpetual, continual.