Unshakeable Calm Unshakeable calm is about calm, confident, happy living. Developed by Nadene van der Linden, Clinical Psychologist, Unshakeable Calm brings you science based tips to you to help you get the life you want. With Unshakeable calm feel: calmer happier more confident & sleep betterScience based tips. No miracles, just real tips that work. Join the free Unshakeable Calm facebook group today for tips, videos and more. Or download Unshakeable Calm’s free tip sheets and guides.