undecipherable
/ʌndɪˈsaɪfəɹəbəl/
"undecipherable" is a 14-letter English headword indexed on PlainSpell.
The verdict
“undecipherable” is uncommon English (outside the top frequency list), classed as an adjective. The kind of spelling people second-guess.
- Unranked
- below top-frequency English
- 14
- letters
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Not easily deciphered; difficult to read.
Corpus desk
Index EN-undecipherable · undecipherable · English
undecipherable · unranked · 0 variants · 0 confusables
- FREQ-UNRANKED Unranked
- LEN-MEGA 14 letters
- VOW-6 6 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-THIN "U" thin
- PHOTO-UNK Peer pending
Read with this headword: Spelling guide for this pattern
Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.
| Property | Value |
|---|---|
| Headword | undecipherable |
| Language | English |
| Part of speech | Adjective |
| IPA | /ʌndɪˈsaɪfəɹəbəl/ |
| Letters | 14 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “undecipherable” sits in English frequency
Rare enough to double-check
undecipherable is uncommon English outside the top frequency list, classed as anadjective, transcribed /ʌndɪˈsaɪfəɹəbəl/. Rarity is why readers land here mid-draft. Gloss: "Not easily deciphered; difficult to read.".
The misspelling generator found no plausible variants for undecipherable, which points to an orthography that plays by predictable English rules. It is not paired with a close-neighbour confusable in our dataset, since its spelling is unusual enough that it doesn't cluster with a lookalike.
Etymologically, the entry records: From un- + decipherable. The correct English form is undecipherable, spelled U-N-D-E-C-I-P-H-E-R-A-B-L-E.
Definition
- 1Not easily deciphered; difficult to read.
Etymology
From un- + decipherable.
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.
PlainSpell is rendered directly from structured Wiktionary extracts and open word-frequency lists, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of September 3, 2026. Primary sources: Wiktionary (via kaikki.org) and FrequencyWords.
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Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.