The letter was handwritten, in a hasty, barely decipherable scrawl.

这封信是手写的，字迹潦草，几乎无法辨认。

《柯林斯英汉双解大词典》

Marks on a clay tablet fragment found in Greece are the oldest known decipherable text in Europe, a new study says.

一个新的研究表明，最近在希腊发现的粘土碑碎片上的记号，是欧洲现知最早的可辨认的文字。

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The biggest problem with toolbars is that although their controls are fast and quickly memorable, they are not initially decipherable.

工具栏最大的问题在于尽管其控件速度快且容易记住，但它们不是一开始就可理解的。

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It wants the current order paper, decipherable only by parliamentary aficionados, to be replaced by a more accessible agenda.

ECONOMIST: Parliament

Adjacent to the pod is an interactive touch-screen timeline magnifying digitized exhibited documents, rendering even his nearly illegible script decipherable.

WSJ: Churchill: The Power of Words | Morgan Library & Museum | The Origins of His Oratory | by Alexander Heffner

Of the five largest ETF issuers, only three are decipherable, given that they are units of giant publicly-traded financial services firms.

FORBES: How to Make Money with ETFs