uncertain

/ʌnˈsɜːtən/

//ʌnˈsɜːtən// adj

By · According to Wiktionary data (CC BY-SA) ·

"uncertain" is a 9-letter English headword indexed on PlainSpell.

The verdict

“uncertain” has 13 generated spelling variants in the English index at frequency #7,299. The variants make it a useful spelling check.

#7,299
frequency rank, English
1,433
“U” headwords
13
tracked misspellings
1
confusable pair

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Not certain; unsure.

Corpus desk

Index EN-uncertain · uncertain · English

uncertain · rank #7,299 · 13 variants · 1 confusable

  • FREQ-COMMON #7,299
  • LEN-LONG 9 letters
  • VOW-4 4 vowels
  • CONFUS-LOW 1 pairs
  • VAR-HIGH 13 variants
  • BOOK-MID 1,433
  • PHOTO-FINISH Troubles

Nearest frequency peer: Troubles (-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 “uncertain”

Lower corpus rank = more everyday usage (inverted bar length for readability)

corpus weight

What this shows Bars show where “uncertain” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.

Source FrequencyWords open word-frequency list As of September 3, 2026

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

uncertain vs uncertainty
82% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for uncertain
PropertyValue
Headworduncertain
LanguageEnglish
Part of speechAdjective
IPA/ʌnˈsɜːtən/
Letters9
Frequency rank#7,299
Misspellings tracked13
Confusable pairs1
SourceWiktionary (kaikki.org)

Where “uncertain” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). uncertain lands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 13 spelling variants around uncertain (IPA /ʌnˈsɜːtən/), anadjective. Corpus frequency is #7,299 among 1,433 “U” headwords. Wiktionary lists 6 senses, so context still picks the gloss.

Our generated misspelling index lists 13 likely wrong-spelling variants for uncertain, with forms such as "nucertain", "ucnertain", and "unccertain". 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, "uncertainty", a pairing that trips writers up because the two words share enough sound or shape to blur together.

Etymologically, the entry records: From Middle English uncerteyn. By surface analysis, un- + certain. The correct English form is uncertain, spelled U-N-C-E-R-T-A-I-N.

Definition

  1. 1
    Not certain; unsure.
  2. 2
    Not known for certain; questionable.
  3. 3
    Not yet determined; undecided.
  4. 4
    Variable and subject to change.
  5. 5
    Fitful or unsteady.
  6. 6
    Unpredictable or capricious.

Recorded use

Wiktionary examples

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

  1. Conſider man without the protection and conduct of a ſuperior Being, and he is ſecure of nothing that he enjoys in this world, and uncertain of every thing that he hopes for.
  2. Tomorrow's weather is uncertain.

Etymology

From Middle English uncerteyn. By surface analysis, un- + certain.

Antonyms

certain

This word in other languages

incierto(Español)incertain(Français)ungewiss(Deutsch)incerto(Português)

Common misspellings

Also misspelled as:

  • nucertain
  • ucnertain
  • unccertain
  • unceratin
  • uncerrtain
  • uncertainn
  • uncertani
  • uncertian
  • uncerttain
  • uncetrain
  • uncretain
  • unecrtain
  • unncertain

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of uncertain - 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.

nucertain2ucnertain2unccertain1unceratin2uncerrtain1uncertainn1uncertani2uncertian2
Edit distance from "uncertain"

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 "uncertain"?
"uncertain" is spelled U-N-C-E-R-T-A-I-N. The IPA pronunciation is /ʌnˈsɜːtən/.
What does "uncertain" mean?
As an adjective, "uncertain" means: Not certain; unsure.
What words are commonly confused with "uncertain"?
"uncertain" is commonly confused with "uncertainty". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "uncertain"?
The IPA (International Phonetic Alphabet) transcription for "uncertain" is /ʌnˈsɜːtən/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "uncertain"?
From Middle English uncerteyn. By surface analysis, un- + certain. 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.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "uncertain", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 9 letters (nearest by frequency rank).

triggered#7,297successor#7,295ancestors#7,310resistant#7,277

Similar misspelling depth

Headwords with a similar count of attested misspellings (13 here; floor ≥5).

Reynolds13 variantsPalestine13 variantsfreshman13 variantshydrogen13 variants

What to do next

You've looked up "uncertain". Here's where to go from here.

  • This headword has one recorded confusable pair with "uncertainty". View pair
  • 13 edit-distance misspelling variants are generated for spell-check research on this headword. See variants
  • Usage frequency rank #7,299 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.

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

Source: FrequencyWords open word-frequency list