undoubtable

adj

"undoubtable" is a 11-letter English headword indexed on PlainSpell.

The verdict

“undoubtable” is uncommon English (outside the top frequency list), classed as an adjective. The kind of spelling people second-guess.

Unranked
below top-frequency English
11
letters

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Incapable of being doubted; undoubted; indubitable.

Corpus desk

Index EN-undoubtable · undoubtable · English

undoubtable · unranked · 0 variants · 0 confusables

  • FREQ-UNRANKED Unranked
  • LEN-MEGA 11 letters
  • VOW-5 5 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.

Key facts for undoubtable
PropertyValue
Headwordundoubtable
LanguageEnglish
Part of speechAdjective
Letters11
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “undoubtable” in English

undoubtablefalls outside the top-100,000 ranked English words, the long-tail zone of technical, archaic, or low-frequency vocabulary, exactly where readers second-guess spellings most.

Beyond rank #100,000. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

undoubtable is uncommon English outside the top frequency list, classed as anadjective. Rarity is why readers land here mid-draft. Gloss: "Incapable of being doubted; undoubted; indubitable.".

No generated misspelling entries exist for undoubtable in our index, and the word's spelling is regular enough that our generator found nothing worth flagging. Our dataset records no confusable match here, which tends to mean the word is visually distinctive enough to stand on its own.

Etymologically, the entry records: From Middle English undoutable, undoutabil, equivalent to un- + doubtable. The correct English form is undoubtable, spelled U-N-D-O-U-B-T-A-B-L-E.

Definition

  1. 1
    Incapable of being doubted; undoubted; indubitable.

Recorded use

Wiktionary example

These source excerpts show how undoubtable appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. Her undoubtable quality had a non-individual flavour, as if standing for her class.

Etymology

From Middle English undoutable, undoutabil, equivalent to un- + doubtable.

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.

Frequently Asked Questions

How do you spell "undoubtable"?
"undoubtable" is spelled U-N-D-O-U-B-T-A-B-L-E.
What does "undoubtable" mean?
As an adjective, "undoubtable" means: Incapable of being doubted; undoubted; indubitable.
What is the origin of the word "undoubtable"?
From Middle English undoutable, undoutabil, equivalent to un- + doubtable. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list