When it wastes your time and money.
First of all the thing that we call "sport karate" is NOT karate at all. Because all they do there is wear those gloves and punch each other in order to win medals. They destroy the whole philosophy that karate has. They turn a martial art into a useless sport.
Useless
He is useless because you stated that he is. He may-not be useless.
USELESS
useless>pointless
The verb in, "the papers are useless to you" is the word "are".
This makeup is useless to me.
No, "useless" is not a comparative adjective. It is a simple adjective used to describe something that has no use or value.
A Useless Death was created in 1972.
Useless Beauty was created in 1926.
The Useless Pages was created in 1994.
The Useless Pages ended in 2001.