assiduousness assiduously • assientist · · · Info · Definitions · Synonyms · Characters · · assiduousness · · Text Latin · · Script 13 · · Length Definitions · · · (noun) great and constant diligence and attention. Synonyms: assiduity, concentration. · · Noun Definition 1 Synonyms · · · assiduity · · Synonym 1 concentration · · Synonym 2 Characters · · a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 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