indefatigability indefaceable • indefatigable · · · Info · Definitions · Synonyms · Characters · · indefatigability · · Text Latin · · Script 16 · · Length Definitions · · · (noun) tireless determination. Synonyms: indefatigableness, tirelessness. · · Noun Definition 1 Synonyms · · · indefatigableness · · Synonym 1 tirelessness · · Synonym 2 Characters · · a latin small letter a U+0061 b latin small letter b U+0062 d latin small letter d U+0064 e latin small letter e U+0065 f latin small letter f U+0066 g latin small letter g U+0067 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E t latin small letter t U+0074 y latin small letter y U+0079