use·less·ness
noun/ˈjuːsləsnəs/
/ˈjuːsləsnəs/
[uncountable]- the fact of not being useful; the fact of not doing or achieving what is needed or wanted
无用的；无效的；无价值的 - He was overwhelmed by feelings of uselessness.
他被一种无用感压垮了。
- He was overwhelmed by feelings of uselessness.