1.
If something is useless, you cannot use it.
He realised that their money was useless in this country...
Computers would be useless without software writers.
? useful
ADJ: usu v-link ADJ
• uselessly
His right arm hung rather uselessly.
ADV
• uselessness
The car had rusted almost to the point of uselessness.
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2.
If something is useless, it does not achieve anything helpful or good.
She knew it was useless to protest.
...a useless punishment which fails to stop drug trafficking.
= pointless
ADJ: oft it v-link ADJ to-inf
• uselessly
Uselessly, he checked the same pockets he'd checked before.
ADV
• uselessness
...the uselessness of their research.
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3.
If you say that someone or something is useless, you mean that they are no good at all. (INFORMAL)
Their education system is useless...
He was useless at any game with a ball.
= hopeless
ADJ: oft ADJ at n
4.
If someone feels useless, they feel bad because they are unable to help someone or achieve anything.
She sits at home all day, watching TV and feeling useless.
ADJ
• uselessness
...the sense of uselessness and the boredom of empty days.
N-UNCOUNT