1.〈文学〉勇敢;精力旺盛的
1.<literary>full of energy; courageous
1.The mettlesome actress resumed her career after recovering from a stroke.
从中风恢复过来后,坚强的女演员又重新开始了她的演艺生涯。
2.Under the rules of the mettlesome, you rattling never undergo.
在这个游戏规则下,你真的永远不会预知结果。