1. 不恰当,无能,愚蠢：19. impede 妨碍,制止 | 20. ineptitude 不恰当,无能,愚蠢 | 21. insinuate 暗示

2. 不称职：inept 不适当的 | ineptitude 不称职 | ineptly 不适当地

3. 愚蠢无能：lentitude 缓慢,懒散 | ineptitude 愚蠢无能 | incertitude 疑惑,不确定

4. 无能,不称职：inept 无能的,不适当的 | ineptitude 无能,不称职 | inequity 不公正,不公平

1. 无能;笨拙
If you refer to someone's ineptitude, you are criticizing them because they do something with a complete lack of skill.

e.g. ...the tactical ineptitude of the allied commander.
盟军指挥官战术上的无能

noun

1. having no qualities that would render it valuable or useful

e.g. the drill sergeant's intent was to convince all the recruits of their worthlessness

Synonym: worthlessness

2. unskillfulness resulting from a lack of training

Synonym: awkwardnessclumsinessineptnessmaladroitnessslowness