[alfnor]

And a similar word:

"In Ancient Greek philosophy, ataraxia (Greek: ἀταραξία, from "a-", negation and tarachē "disturbance, trouble") is a lucid state of robust equanimity characterized by ongoing freedom from distress and worry. In non-philosophical usage, ataraxia was the ideal mental state for soldiers entering battle. Achieving ataraxia is a common goal for Pyrrhonism, Epicureanism, and Stoicism, but the role and value of ataraxia within each philosophy varies in accordance with their philosophical theories."

[pengstrom]

So that's why the anti-anxiety drug is called Atarax.

[Jolter]

Permit me to quote the article you’re commenting on.

> 10. Ataraxia (Greek: ἀταραξία) > Ataraxia literally translates as “unperturbedness”, but is generally considered as “imperturbability”, “equanimity”, or “tranquillity”.