Spike the Bulldog was a formidable adversary to Tom, who would often beat up on the cat egged on by the crafty little mouse.

穗位难缠的对手的牛头犬是汤姆，他经常击败了猫的怂恿下狡猾的小老鼠。

youdao

If Iran were able to make high-placed friends in Egypt, where Mr Ahmadinejad is popular for defying the West, Israel's sense of encirclement by its most formidable adversary would be almost complete.

如果伊朗能够同埃及高官做朋友(在埃及，内贾德藐视西方的态度是出了名的)，由以色列最强大可怕的敌人形成的包围圈就算完成了。

youdao

They tell us, Sir, that we are weak — unable to cope with so formidable an adversary.

先生，他们告诉我们，我们是弱小的——不能应付如此强大的对手。

youdao

He's a formidable adversary, and negotiating with him is not a lot of fun.

CNN: Captured U.S. soldiers face military court in Yugoslavia

He could by turns be incredibly generous, funny, playful and kind, while at the same time Mr Winner made a formidable adversary.

BBC: Michael Winner: stars pay tribute

Meanwhile, the senior U.S. envoy who had spearheaded efforts to get Milosevic to sign onto a Kosovo peace deal said Thursday the Yugoslav president was "a formidable adversary" who chose bombings over diplomacy.

CNN: Captured U.S. soldiers face military court in Yugoslavia