unmercifulness unmercifully • unmercurial · · · Info · Definitions · Synonyms · Characters · · unmercifulness · · Text Latin · · Script 14 · · Length 5 · · Syllables Definitions · · · (noun) inhumaneness evidenced by an unwillingness to be kind or forgiving. Synonyms: mercilessness. · · Noun Definition 1 Synonyms · · · mercilessness · · Synonym 1 Characters · · c latin small letter c U+0063 e latin small letter e U+0065 f latin small letter f U+0066 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 u latin small letter u U+0075