indecipherable
adj. 无法解释的；破译不出的；难辨认的
例句
He uttered little indecipherable sounds.
他声音很小，听不清楚。
《柯林斯英汉双解大词典》
Majid's writing was virtually indecipherable.
玛吉的笔迹几乎无法辨认。
Two types of images substantiate this theory: the strange, indecipherable geometric shapes that appear near some animals, and the few drawings of men.
两种类型的图形证实了这种看法：在某些动物图形和极少数的人类图像附近存在着一些奇怪而难以辨认的几何图形。
