invincible

1. ADJ If you describe an army or sports team as invincible, you believe that they cannot be defeated. 不可战胜的

You couldn't help feeling the military's fire power was invincible. 你不禁会感到这支军队的火力是无可匹敌的。

2. ADJ If someone has an invincible belief or attitude, it cannot be changed. 无法改变的

He also had an invincible faith in the medicinal virtues of garlic. 他对大蒜的药用功效深信不疑。