adj.(因枯燥晦涩而)不值一读的，难以卒读的，(面部表情)揣摩不透的，难以捉摸的，无法读取的，打不开的

The cryptographic code was an unreadable jumble of symbols.
这个密码代码是一堆难以辨认的符号。
Her handwriting was so illegible that no one could decipher her notes.
她的字迹模糊不清，没人能读懂她的笔记。
The ancient runes on the artifact were completely unreadable to modern eyes.
那件文物上的古代符文对现代人来说完全无法解读。
The dense mathematical equation appeared as an unreadable wall of symbols.
这道复杂的数学公式像一堵看不懂的符号墙。
The faded ink made the old manuscript virtually unreadable.
古旧的手稿因为墨水褪色而几乎无法阅读。
The blurry screen displayed an unreadable array of numbers and letters.
模糊的屏幕上显示了一串看不清楚的数字和字母。
The hieroglyphics in the museum were too intricate for any casual observer to comprehend.
博物馆里的象形文字过于复杂，没有专业知识的人无法理解。
The hastily scribbled note was filled with illegible scrawls, leaving no clue to its meaning.
那张匆忙写下的便条满是难以辨认的涂鸦，让人猜不出其含义。
The microfilm was damaged, rendering the historical documents unreadable.
微缩胶片受损，使得那些历史文件变得无法阅读。
The author's handwriting was so cramped that it was nearly unreadable, even under a magnifying glass.
作者的笔迹过于紧凑，即使在放大镜下也几乎无法辨认。