useless
US /ˈjuːs.ləs/
UK /ˈjuːs.ləs/
1.
serving no purpose; completely without use
:
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This broken pen is completely useless.
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It's useless to argue with him; he never changes his mind.
2.
having no ability or skill in a particular area
:
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I'm completely useless at math.
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He's useless with computers.