General peacefulness:
* Tranquil: Calm and peaceful; without disturbance.
* Serene: Calm, peaceful, and untroubled; tranquil.
* Equanimous: Mentally calm, even-tempered, and composed.
* Content: Satisfied and at ease.
* Harmonious: In a state of agreement or balance; peaceful.
* Composed: Calm, controlled, and self-possessed.
* Relaxed: Free from tension and anxiety.
Inner peace:
* At ease: Free from worry or stress.
* Fulfilled: Having achieved a sense of satisfaction and contentment.
* Balanced: Having a sense of inner harmony and stability.
* Centered: Focused and grounded; at peace with oneself.
* Enlightened: Possessing a deep understanding and wisdom.
Peace with others:
* Reconciled: Having resolved differences and restored harmony.
* Forgiving: Willing to let go of resentment and anger.
* United: Joined together in harmony and understanding.
The best word to use will depend on the specific context and the feeling you want to convey.