at_peace
1. [ adjective ] in a state of tranquil contentment
Examples:

"at peace with herself and her friends"

Related terms: contented
2. [ adjective ] free from strife
Examples:

"a world at peace"

Related terms: peaceful
3. [ adjective ] (euphemistic) dead "he is deceased"
Synonyms: deceased gone departed at_rest asleep
Examples:

"our dear departed friend"

Related terms: euphemism dead