useless
US /ˈjuːs.ləs/
UK /ˈjuːs.ləs/

1.
無用的, 沒用的
serving no purpose; completely without use
:
•
This broken pen is completely useless.
這支壞掉的筆完全沒用。
•
It's useless to argue with him; he never changes his mind.
和他爭論是沒用的;他從不改變主意。
2.
無能的, 不擅長的
having no ability or skill in a particular area
:
•
I'm completely useless at math.
我數學完全不行。
•
He's useless with computers.
他對電腦一竅不通。