inefficaciousness inefficaciously • inefficacity · · · Info · Definitions · Synonyms · Characters · · inefficaciousness · · Text Latin · · Script 17 · · Length Definitions · · · (noun) a lack of efficacy. Synonyms: inefficacy. · · Noun Definition 1 Synonyms · · · inefficacy · · Synonym 1 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 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073 u latin small letter u U+0075