Fortitude indefatigability perseverance persevere tenacity.不屈不挠....

n.不疲劳，不屈不挠...

indefatigability的音标：indefatigability的英式发音音标为：[ɪndɪfætɪɡə'bɪlɪtɪ]indefatigability的美式发音音标为：[ɪndɪfætɪɡə'bɪlɪtɪ]...