unalterable

adj

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

The verdict

“unalterable” is uncommon English (frequency #88,967 among 1,433 “U” headwords), classed as an adjective. The kind of spelling people second-guess.

#88,967
frequency rank, English
1,433
“U” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Incapable of being altered, or of changing.

Corpus desk

Index EN-unalterable · unalterable · English

unalterable · rank #88,967 · 0 variants · 0 confusables

  • FREQ-RARE #88,967
  • LEN-MEGA 11 letters
  • VOW-5 5 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-MID 1,433
  • PHOTO-FINISH ulu

Nearest frequency peer: ulu (-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.

Long-tail ranks near “unalterable”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

What this shows Long-tail view: where “unalterable” sits against similarly uncommon English ranks.

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for unalterable
PropertyValue
Headwordunalterable
LanguageEnglish
Part of speechAdjective
Letters11
Frequency rank#88,967
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “unalterable” in English

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

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

The axis is logarithmic, with each marked tick roughly ten times rarer than the last. Rare peers in the same band: “ulu” (#88,966), “uncirculated” (#88,968), “Ulric” (#88,965). Among 1,433 “U” headwords, “unalterable” is #88,967. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

unalterable is uncommon English at frequency #88,967 among 1,433 “U” headwords, classed as anadjective. Rarity is why readers land here mid-draft. 2 senses are on record.

No misspelling variants are generated for unalterable in our index, a straightforward case of a spelling with little room for common typos. This entry stands alone in our confusable dataset, since no other headword is close enough in sound or shape to pair with it.

Etymologically, the entry records: From un- + alterable. The correct English form is unalterable, spelled U-N-A-L-T-E-R-A-B-L-E.

Definition

  1. 1
    Incapable of being altered, or of changing.
  2. 2
    Irreversible, irrevocable.

Recorded use

Wiktionary examples

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

  1. People of unalterable ideas still insisted upon calling him "Sergeant" when they met him, which was in some degree owing to his having still retained the well-shaped moustache of his military days, and the soldierly bearing inseparable from his form.
  2. ... every statute in the Bible and in the law books is an attempt to defeaat a law of God—in other words an unalterable and indestructible law of nature.

Etymology

From un- + alterable.

Synonyms

Antonyms

This word in other languages

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 "unalterable"?
"unalterable" is spelled U-N-A-L-T-E-R-A-B-L-E.
What does "unalterable" mean?
As an adjective, "unalterable" means: Incapable of being altered, or of changing.
What is the origin of the word "unalterable"?
From un- + alterable. 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 "unalterable", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 11 letters (nearest by frequency rank).

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

Source: FrequencyWords open word-frequency list