n.疲劳,倦怠
a tireless campaigner for human rights
不屈不挠的人权运动参与者
He was quite tireless, bubbling over with vitality.
他毫无倦意,兴致勃勃地说个没完。
He was a tireless worker for justice.
他是个为了正义不知疲倦地工作的人。