1) Inner peace 1) Peace of mind 2) Placidity 3) Quiet 4) Repose 5) Serenity 6) State of tranquillity 7) Tranquility 8) Tranquillity 
Ataraxia (ἀταραξία `tranquility`) is a Greek term used by Pyrrho and Epicurus for a lucid state of robust tranquility, characterized by ongoing freedom from distress and worry. ==For the Epicureans== For the Epicureans, ataraxia was synonymous with the only true happiness possible for a person. It signifies the state of robust tranquili.....
tranquility; freedom from anxiety; stoicism
• (n.) Alt. of Ataraxy
(from the article `Skepticism`) Sextus said that his arguments were aimed at leading people to a state of ataraxia (unperturbability). People who thought that they could know ...
Calmness and peace of mind; tranquility. ... Origin: G. A-priv. + taraktos, disturbed, + -ia ... (05 Mar 2000) ... 
(at″ә-rak´se-ә) serenity, calmness, peace of mind.
Type: Term Pronunciation: at′ă-rak′sē-ă Definitions: 1. Calmness and peace of mind; tranquility.
a tranquil and calm state of mind.
[n] - peace of mind
ataraxia, ataractic 1. The absence of anxiety or confusion; imperturbability; untroubled calmness; inner harmony. 2. A tranquilizer; having a tranquilizing or calming effect.
noun peace of mind
The Epicurean doctrine that the complete peace of mind was a pleasurable state of equilibrium. See Epicureanism. -- E.H.
a state of freedom from emotional disturbance and anxiety; tranquillity.