1. peacefulness(n = noun.state) peaceableness - a state that is calm and tranquil;
is a kind of amity
has particulars: mollification
Derived form adjective peaceful2
2. peacefulness(n = noun.feeling) ataraxis, heartsease, peace, peace of mind, repose, serenity - the absence of mental stress or anxiety;
is a kind of quietness, quietude, tranquility, tranquillity