peacefulness peacefully • peaceless · · · Info · Definitions · Synonyms · Characters · · peacefulness · · Text Latin · · Script 12 · · Length Definitions · · · (noun) a state that is calm and tranquil. Synonyms: peaceableness. · · Noun Definition 1 (noun) the absence of mental stress or anxiety. Synonyms: peace, peace of mind, repose, serenity, heartsease, ataraxis. · · Noun Definition 2 Synonyms · · · peaceableness · · Synonym 1 peace · · Synonym 2 peace of mind · · Synonym 3 repose · · Synonym 4 serenity · · Synonym 5 heartsease · · Synonym 6 ataraxis · · Synonym 7 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 f latin small letter f U+0066 l latin small letter l U+006C n latin small letter n U+006E p latin small letter p U+0070 s latin small letter s U+0073 u latin small letter u U+0075