unless

/ənˈlɛs/

//ənˈlɛs// conj

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

"unless" is a 6-letter English headword indexed on PlainSpell.

The verdict

“unless” is a regularly-used English word, ranked #1,131 in English word frequency and used as a conjunction.

#1,131
frequency rank, English
6
letters
7
tracked misspellings
4
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Except on a specified condition; if not.

Visual similarity to commonly confused words

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

unless vs unrest
67% similar
unless vs useless
71% similar
unless vs unleash
71% similar

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

Key facts for unless
PropertyValue
Headwordunless
LanguageEnglish
Part of speechConjunction
IPA/ənˈlɛs/
Letters6
Frequency rank#1,131
Misspellings tracked7
Confusable pairs4
SourceWiktionary (kaikki.org)

Where “unless” 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). unless lands here:

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

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

Spelling & Dictionary Insight

The English entry for unless is 6 letters long, classified as a conjunction, and transcribed in the International Phonetic Alphabet as /ənˈlɛs/. Corpus data places it at rank #1,131 in overall English word frequency, indicating it appears regularly in written and spoken text. Wiktionary records 3 distinct senses for this headword, so context determines which meaning a reader should apply.

Our generated misspelling index lists 7 likely wrong-spelling variants for unless, with forms such as "nuless", "ulness", and "unelss". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. It also participates in 4 confusable-pair relationships, "unrest", "useless", "unleash", and more, where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: From Middle English unlesse, earlier on lesse (modern on + less), from (not) on lesse (than) (“(not) on a less compelling condition (than)”). The quality of negation in the word and the lack of stress changed on to un-. The correct English form is unless, spelled U-N-L-E-S-S.

Definition

  1. 1
    Except on a specified condition; if not.
  2. 2
    If not; used with counterfactual conditionals.
  3. 3
    Except if; used with hypothetical conditionals.

Etymology

From Middle English unlesse, earlier on lesse (modern on + less), from (not) on lesse (than) (“(not) on a less compelling condition (than)”). The quality of negation in the word and the lack of stress changed on to un-.

Antonyms

if

This word in other languages

salvo(Español)à moins que(Français)

Common misspellings

Also misspelled as: nuless,ulness,unelss,unles,unlless,unlses,unnless

Misspelling Pattern Breakdown

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

nuless2ulness2unelss2unles1unlless1unlses2unnless1
Edit distance from "unless"

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

How do you spell "unless"?
"unless" is spelled U-N-L-E-S-S. The IPA pronunciation is /ənˈlɛs/.
What does "unless" mean?
As a conjunction, "unless" means: Except on a specified condition; if not.
What words are commonly confused with "unless"?
"unless" is commonly confused with "unrest", "useless", "unleash". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "unless"?
The IPA (International Phonetic Alphabet) transcription for "unless" is /ənˈlɛs/. 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 "unless"?
From Middle English unlesse, earlier on lesse (modern on + less), from (not) on lesse (than) (“(not) on a less compelling condition (than)”). The quality of negation in the word and the lack of stress changed on to un-. 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.

Using “unless”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is U-N-L-E-S-S - every other letter order is a misspelling in standard orthography.
  • Say it as /ənˈlɛs/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
  • Don't mix it up with “unrest” - see the side-by-side comparison. unless vs unrest
  • 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.

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

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list