undoubtedly
/ʌnˈdaʊtɪdli/
"undoubtedly" is a 11-letter English headword indexed on PlainSpell.
The verdict
“undoubtedly” is a regularly-used English word, ranked #8,621 in English word frequency and used as an adverb.
- #8,621
- frequency rank, English
- 11
- letters
- 17
- tracked misspellings
- 1
- confusable pair
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Without doubt; definitely.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | undoubtedly |
| Language | English |
| Part of speech | Adverb |
| IPA | /ʌnˈdaʊtɪdli/ |
| Letters | 11 |
| Frequency rank | #8,621 |
| Misspellings tracked | 17 |
| Confusable pairs | 1 |
| Source | Wiktionary (kaikki.org) |
Where “undoubtedly” sits in English frequency
Spelling & Dictionary Insight
The English entry for undoubtedly is 11 letters long, classified as an adverb, and transcribed in the International Phonetic Alphabet as /ʌnˈdaʊtɪdli/. Corpus data places it at rank #8,621 in overall English word frequency, indicating it appears regularly in written and spoken text. The dominant gloss from Wiktionary reads: "Without doubt; definitely.".
Our generated misspelling index lists 17 likely wrong-spelling variants for undoubtedly, with forms such as "nudoubtedly", "udnoubtedly", and "unddoubtedly". 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. It also participates in 1 confusable-pair relationship, "undoubted", where similar look or sound leads writers to substitute one word for another in context.
Etymologically, the entry records: From Middle English undoutedly, equivalent to undoubted + -ly. The correct English form is undoubtedly, spelled U-N-D-O-U-B-T-E-D-L-Y.
Definition
- 1Without doubt; definitely.
Etymology
From Middle English undoutedly, equivalent to undoubted + -ly.
This word in other languages
Common misspellings
Also misspelled as: nudoubtedly,udnoubtedly,unddoubtedly,undobutedly,undoubbtedly,undoubetdly,undoubtdely,undoubteddly,undoubtedlly,undoubtedlyy,undoubtedyl,undoubteldy,undoubttedly,undoutbedly,unduobtedly,unndoubtedly,unodubtedly
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of undoubtedly - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.
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.
Frequently Asked Questions
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Using “undoubtedly”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is U-N-D-O-U-B-T-E-D-L-Y - every other letter order is a misspelling in standard orthography.
- Say it as /ʌnˈdaʊtɪdli/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Don't mix it up with “undoubted” - see the side-by-side comparison. undoubtedly vs undoubted
- Browse more English words and confusable pairs in the same reference. English words
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.