mercilessness mercilessly • merciment · · · Info · Definitions · Synonyms · Antonyms · Characters · · mercilessness · · Text Latin · · Script 13 · · Length 5 · · Syllables Definitions · · · (noun) feelings of extreme heartlessness. Synonyms: cruelty, pitilessness, ruthlessness. · · Noun Definition 1 (noun) inhumaneness evidenced by an unwillingness to be kind or forgiving. Synonyms: unmercifulness. · · Noun Definition 2 Synonyms · · · cruelty · · Synonym 1 pitilessness · · Synonym 2 ruthlessness · · Synonym 3 unmercifulness · · Synonym 4 Antonyms · · · mercifulness · · Antonym 0 mercy · · Antonym 1 Characters · · c latin small letter c U+0063 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E r latin small letter r U+0072 s latin small letter s U+0073