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If something is indecipherable, you cannot read it or work out what it means. Wet ink, tiny handwriting, a code with no key, a mumbled line on a bad recording — all can be indecipherable. It is stronger than “messy” or “hard to read.” Hard to read means you might get there with time. Indecipherable means you are stuck. Though actually, people stretch it. A look, a poem, or a set of rules can be called indecipherable when the speaker really means “I cannot make sense of this,” not that the letters themselves fail. That looser use is common and a bit dramatic. The word is not slang, and it is not rare; you will see it in news and novels.
難以辨認的；無法解讀的
組成From in- (not) + decipherable. Decipherable is decipher + -able: able to be worked out. Decipher itself is built on cipher, a code. So the whole word means “not able to be decoded.”
同家族的字
- decipherthe verb: to work out a coded or unclear message
- decipherableable to be deciphered; this word is in- + decipherable
- ciphera code; decipher is built on this
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
indecipherableadj/ɪndɪˈsaɪfəɹəbəl/
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Not decipherable; impossible to decode, read, understand or comprehend.
- The doctor's handwriting was indecipherable.
- The second and third quarters of the shield are indecipherable on the stone but clearer in two other representations of the arms, a painted wooden funeral hatchment for Mary Davie[…]
- 2
Indistinguishable
- The explanation some are suggesting is that the object takes on the appearance of what is behind it, or that it takes on the appearanec ^([sic]) of what the observer thinks is behind it. In both cases, the object is still visible. It's a visible representation of what's behind it, but it is still invisible, just indecipherable from its surroundings.
- If you knew who Jerry was you'd swear you'd been cloned. Your posting style is virtually indecipherable from his.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。