Questions about example sentences with, and the definition and usage of "Useless"

A: of no use
The book was useless, it did not answer my question

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A: worth nothing/no purpose

A: 無用

A: Knowledge is useless if you don't put it into practice.

A broken key is useless.

A: useless - inútil, sem uso

I can't deal with useless people. I need accurate people around.
I'm going to donate those things I find useless.

A: It is useless to use Yen in America.

A broken car is useless to have.

When no one needs you, you're called useless.

A: Useless could mean unhelpful, but pointless can’t. For example,
-You’re utterly useless, you know that? I can’t even count on you to...

Pointless implies without a purpose/futile. For example,
-It is pointless to keep fighting. Just face it, you’ve lost. (You could also use “useless” here though)

So, useless could be used synonymously with pointless with the meaning “futile/without purpose” but pointless can’t be used synonymously with the word useless to mean “unhelpful.” Hopefully I didn’t make that confusing! 😅

A: Useless means it has no use. Idle means stationary, motionless, and hence by extension can be said to have a synonymous meaning, when saying someone is idling around (i.e. not doing anything)

A: Useless means that it's of no use anymore

Used means it's already been used

Examples: This broken screwdriver is useless.

This game has been used, so it's discounted.

A: Usually, they are used to mean the same thing, but sometimes they mean a little differently.

useless = cannot be used (broken, pointless)
needless = unneeded (it can be used, but no one wants or needs to use it)
OR needless = gratuitous ("needless violence" is violence for no reason, violence just because you want to be violent)

A: @Nimloth: 对。Useless 也可以用在东西上，指没用。Unuseful只用在东西上。不管用而已，不是完全没用。

A: Inutile=useless

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A: to me

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