(每日一词）ineptitude

Ineptitude  /ˌɪnˈep.tə.tuːd/ n. 无能;笨拙;无效 

Meaning: If you refer to someone's ineptitude, you are criticizing them because they do something with a complete lack of skill.

前缀: in-否定

词根: ept-, apt- 能力 (aptitude, adapt) 

后缀: -itude 抽象名词后缀

e.g.  Ineptitude is not a mark of failure, but an opportunity for growth and improvement. 无能并不是失败的标志，而是成长和改进的机会。