unfathomable
/(ˌ)ʌnˈfæðəməbl̩/
"unfathomable" is a 12-letter English headword indexed on PlainSpell.
The verdict
“unfathomable” has 19 generated spelling variants in the English index at frequency #32,637. The variants make it a useful spelling check.
- #32,637
- frequency rank, English
- 1,433
- “U” headwords
- 19
- tracked misspellings
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Impossible to fathom.
Corpus desk
Index EN-unfathomable · unfathomable · English
unfathomable · rank #32,637 · 19 variants · 0 confusables
- FREQ-MID #32,637
- LEN-MEGA 12 letters
- VOW-5 5 vowels
- CONFUS-0 No pairs
- VAR-HIGH 19 variants
- BOOK-MID 1,433
- PHOTO-FINISH uneventful
Nearest frequency peer: uneventful (-1 rank slots)
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.
Frequency neighbourhood for “unfathomable”
Lower corpus rank = more everyday usage (inverted bar length for readability)
- undying
undying
67,367 corpus weight
- unequivocal
unequivocal
67,366 corpus weight
- uneventful
uneventful
67,365 corpus weight
- unfathomable
unfathomable
67,364 corpus weight
- ungodly
ungodly
67,363 corpus weight
- unprofitable
unprofitable
67,362 corpus weight
What this shows Bars show where “unfathomable” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.
| Property | Value |
|---|---|
| Headword | unfathomable |
| Language | English |
| Part of speech | Adjective |
| IPA | /(ˌ)ʌnˈfæðəməbl̩/ |
| Letters | 12 |
| Frequency rank | #32,637 |
| Misspellings tracked | 19 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “unfathomable” sits in English frequency
A misspelling magnet
The generator records 19 spelling variants around unfathomable (IPA /(ˌ)ʌnˈfæðəməbl̩/), anadjective. Corpus frequency is #32,637 among 1,433 “U” headwords. Wiktionary lists 2 senses, so context still picks the gloss.
Our generated misspelling index lists 19 likely wrong-spelling variants for unfathomable, with forms such as "nufathomable", "ufnathomable", and "unafthomable". Each variant is a distinct typo pattern an edit-distance generator flags, typically a doubled-consonant error, a silent-letter drop, or a vowel substitution. Our dataset records no confusable match here, since its spelling is unusual enough that it doesn't cluster with a lookalike.
Etymologically, the entry records: From un- (prefix meaning ‘not’) + fathom (“to measure the depth of (water); (figurative) to deeply understand (someone or something)”) + -able (suffix forming adjectives denoting things not able or fit to be done). The correct English form is unfathomable, spelled U-N-F-A-T-H-O-M-A-B-L-E.
Definition
- 1Impossible to fathom.
- 2Impossible to fathom.
Recorded use
Wiktionary examplesThese source excerpts show how unfathomable appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
[W]e are not to make our eſtimate of the quantity of VVaters meerly by the Superficies of the Sea, but by its vaſt depth, vvhich in ſome places is unfathomable, and by thoſe vaſt ſubterraneous Receptacles of VVater vvhich pour themſelves out in ſeveral great Ebullitions and Marine Springs: […]
But if we yet rise higher, and consider the fixed stars as so many vast oceans of flame, that are each of them attended with a different set of planets, and still discover new firmaments and new lights, that are sunk farther in those unfathomable depths of ether, so as not to be seen by the strongest of our telescopes, we are lost in such a labyrinth of s…
Etymology
From un- (prefix meaning ‘not’) + fathom (“to measure the depth of (water); (figurative) to deeply understand (someone or something)”) + -able (suffix forming adjectives denoting things not able or fit to be done).
This word in other languages
Common misspellings
Also misspelled as:
- nufathomable
- ufnathomable
- unafthomable
- unfahtomable
- unfathhomable
- unfathmoable
- unfathoamble
- unfathomabble
- unfathomabel
- unfathomablle
- unfathomalbe
- unfathombale
- unfathomible
- unfathommable
- unfatohmable
- unfatthomable
- unffathomable
- unftahomable
- unnfathomable
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of unfathomable - expressed in single-character edits (insert, delete, or swap one letter). Bigger bars stand out at a glance; a one-edit slip is the hardest to catch.
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). 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.
Frequently Asked Questions
How do you spell "unfathomable"?
What does "unfathomable" mean?
What are common misspellings of "unfathomable"?
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What is the origin of the word "unfathomable"?
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Similar English words by spelling shape
Same letter count and similar misspelling depth for "unfathomable", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 12 letters (nearest by frequency rank).
Similar misspelling depth
Headwords with a similar count of attested misspellings (19 here; floor ≥5).
What to do next
You've looked up "unfathomable". Here's where to go from here.
- 19 edit-distance misspelling variants are generated for spell-check research on this headword. See variants
- Usage frequency rank #32,637 among English headwords in this corpus. Corpus statistics
- Browse more English words in the "U" letter cohort. U–Z browse
- PlainSpell rotates a curated Word of the Day from the English corpus, a passive way to discover vocabulary. Word of the Day
PlainSpell is a reference corpus, not spelling advice. Verify unusual forms in context.
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.