Useful vs. Useless — What's the Difference?

Difference Between Useful and Useless
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Definitions
Useful➦
Able to be used for a practical purpose or in several ways
Aspirins are useful for headaches
Useless➦
Being or having no beneficial use; ineffective
This pen is useless because it's out of ink.
Useful➦
Having a beneficial use; serviceable
A useful kitchen gadget.
Useless➦
Having no purpose or reason; pointless; to no avail
It's useless to argue over matters of taste.
Useful➦
Being of practical use
A useful job.
Useful members of society.
Useless➦
Incapable of acting or functioning effectively; ineffectual or inept
He panics easily and is useless in an emergency.
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Useful➦
Having a practical or beneficial use.
Useless➦
Without use or possibility to be used.
This fork's prongs are bent. It's useless now.
Useful➦
Full of use, advantage, or profit; producing, or having power to produce, good; serviceable for any end or object; helpful toward advancing any purpose; beneficial; profitable; advantageous; as, vessels and instruments useful in a family; books useful for improvement; useful knowledge; useful arts.
To what can I useful!
Useless➦
Unhelpful, not useful; pointless (of an action).
I think it's useless to keep this discussion going. It's like talking to a brick wall.
I tried my best to make him quit smoking, but my efforts were useless. He now smokes six packs a day.
Useful➦
Being of use or service;
The girl felt motherly and useful
A useful job
A useful member of society
Useless➦
Good-for-nothing; not dependable.
Bill never mows the lawn, takes out the trash or anything. He's useless, but I love him anyways.
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Useful➦
Of great importance or use or service;
Useful information
Valuable advice
Useless➦
Unable to do well at a particular task or thing. Useless is mildly insulting.
My brother is useless at most computer games, but he is an awesome PS2 player.
Why do you keep trying? You're obviously useless at it.
Useful➦
Capable of being turned to use or account;
Useful applications of calculus
Useless➦
Having, or being of, no use; unserviceable; producing no good end; answering no valuable purpose; not advancing the end proposed; unprofitable; ineffectual; as, a useless garment; useless pity.
Not to sit idle with so great a giftUseless, and thence ridiculous.
Useless are all wordsTill you have writ "performance" with your swords.The other is for waiving.
Waiving all searches into antiquity, in relation to this controversy, as being either needless or fruitless.
Even our blessed Savior's preaching, who spake as never man spake, was ineffectual to many.
Useful➦
Having a useful function;
Utilitarian steel tables
Useless➦
Having no beneficial use or incapable of functioning usefully;
A kitchen full of useless gadgets
She is useless in an emergency
Useless➦
Not useful;
A curiously unhelpful and useless manual