arduousness arduously • ardurous · · · Info · Definitions · Synonyms · Characters · · arduousness · · Text Latin · · Script 11 · · Length Definitions · · · (noun) extreme effortfulness. Synonyms: strenuousness. · · Noun Definition 1 Synonyms · · · strenuousness · · Synonym 1 Characters · · a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 u latin small letter u U+0075