adj.可怕的;令人敬畏的;难以对付的;
例句:
They had to overcome formidable obstacles.
他们得克服重重障碍。
a dangerous/worthy/formidable opponent
危险的 / 势均力敌的 / 强大的对手
Unarmed they provide formidable opposition, and they are even more dangerous when wielding hammer or club.
没有装甲保护的情况下他们就能提供可怕的敌对力量, 他们在挥动锤子或者木棒的时候将更加危险.