very different to before, or changed very much, and therefore not able to be recognized

She returned to the United States to find a country that seemed almost unrecognizable from the one she had left as a young woman. 她回到美国，发现这个国家似乎跟她年轻时离开的那个国家大相径庭。

He had been beaten so severely that he was unrecognizable. 他被打得很惨，几乎认不出来了。

not clear enough or known well enough to be able to be recognized

The other picture was of an unrecognisable small boy, holding a hand up to the camera. 另一张照片是一个模糊不清的小男孩，一只手举向相机。

The truck was flying an unrecognizable flag. 那辆卡车挂着一面认不出来的旗子。