useless or futile; of no avail; fruitless labor 这是～的。This will be of no avail./抵赖事实，推卸责任，那是～的。It is futile for you to deny the facts and shirk responsibility./～无功（益）make a futile effort (or attempt);work to no avail/～往返make a futile journey;hurry back and forth for nothing