Imperturbable: not excitable, calm (Concise Oxford Dictionary)
The adjective imperturbable is the flip side of perturbable, which comes from perturb, which in turn traces back to the Latin word perturbare, meaning “to confuse” or “to disturb.” If something really annoying is going on, like one neighbor is jack-hammering his driveway and another has a dog that’s barking while you’re trying to sleep because you were up all night studying and you really really need a nap, but you stay calm and don’t get upset, you are imperturbable. https://www.vocabulary.com/dictionary/imperturbable
- Regard brightly colored flowers. Those in earth, still growing, tend to be the most effective, particularly in deepest winter.
- Relax your shoulders. Pull the shoulder blades slightly together. This will broaden your chest and open your lungs, giving others the impression that you are imperturbable while you are in the process of becoming imperturbable.
- Know when the streetlights come on. Whatever else happens to surprise and disorient you (temperature, weather, unexpected visitors, no milk in the fridge), the inevitability of the streetlights coming on will give you a sense of consistency and stability.
- Avoid caffeinated drinks, the news, speaking in tongues.
- Walk backwards in a meadow. Observe blades of grass rising up after you’ve passed. Grass does not rise up? Walk forwards. Do not look back.
- Think your own thoughts when others are talking to you (especially family or business colleagues, telemarketers).
- Ensure you have a comfortable bed, duvet and pillow.
- Wear clothes that are neither too light nor too dark, nor too tight or too loose.
- Do not keep or heed lists of any kind.