I have a subscription to the OED. A lot of these are based on that source.
These are words found on the NVC feelings wheel under “Peaceful”.
Peaceful: Not employing force or violence. An alternative solution to a problem where force, violence and war is the more obvious means; friendly; pleasant; favorable; benign; amicable, affable.
Calm: Free from agitation or disturbance: still, quiet, tranquility.
Content: Full inward satisfaction – not disturbed for desire by anything more.
Satisfied: met, answered, fully supplied.
Comfortable: A state of tranquil enjoyment and content; free from pain and trouble – ease
Relaxed: free from tension, anxiety, stress.
Serene: Calm mixed with cheer and radiance.
Calm: Free from agitation or disturbance; quiet, still, tranquil, serene; without wind, not stormy.
Tranquil: Free from agitation or disturbance; calm, serene, placid, quiet, peaceful.
Quiet: absence of commotion or bustle, free from discord or strife, free from noise or uproar.
Centered: Serene + Inner Peace and/or Harmon – emotionally well balanced
Harmony: Internal parts and stories are united in opinion, unanimous and free from discord or dissent
Congruous: A feeling something is reasonable, becoming, fitting, suitable or appropriate to who you are.
Balanced: Emotional Equilibrium – Opposing parts are in equality.