inestimable

/ɪˈnɛs.tɪ.mə.bəl/

//ɪˈnɛs.tɪ.mə.bəl// adj

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

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

The verdict

“inestimable” is uncommon English (frequency #81,428 among 2,140 “I” headwords), classed as an adjective. The kind of spelling people second-guess.

#81,428
frequency rank, English
2,140
“I” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Not able to be estimated; not able to be calculated, computed or comprehended, as because of great scale, degree or magnitude.

Corpus desk

Index EN-inestimable · inestimable · English

inestimable · rank #81,428 · 0 variants · 0 confusables

  • FREQ-RARE #81,428
  • LEN-MEGA 11 letters
  • VOW-5 5 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-MID 2,140
  • PHOTO-FINISH imprisons

Nearest frequency peer: imprisons (-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 “inestimable”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

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

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for inestimable
PropertyValue
Headwordinestimable
LanguageEnglish
Part of speechAdjective
IPA/ɪˈnɛs.tɪ.mə.bəl/
Letters11
Frequency rank#81,428
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “inestimable” in English

This scale runs from the tiny cluster of words that carry ordinary speech (left) to the long tail of words almost nobody reaches for (right).inestimablefalls in this rarity band:

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

Scale is logarithmic (each tick is 10× rarer). Rare peers in the same band: “imprisons” (#81,427), “inferential” (#81,429), “imbibing” (#81,426). Among 2,140 “I” headwords, “inestimable” is #81,428. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

inestimable is uncommon English at frequency #81,428 among 2,140 “I” headwords, classed as anadjective, transcribed /ɪˈnɛs.tɪ.mə.bəl/. Rarity is why readers land here mid-draft. 2 senses are on record.

We couldn't generate a plausible misspelling set for inestimable, typically a sign the spelling maps closely to how the word sounds. Our dataset records no confusable match here, a sign it's visually distinctive enough not to be mixed up with another word.

Etymologically, the entry records: From Middle French inestimable, from Latin inaestimābilis, from in (“un-”, “not”) + aestimābilis (“estimable”). Equivalent to in- + estimable. The correct English form is inestimable, spelled I-N-E-S-T-I-M-A-B-L-E.

Definition

  1. 1
    Not able to be estimated; not able to be calculated, computed or comprehended, as because of great scale, degree or magnitude.
  2. 2
    Venerable, great.

Recorded use

Wiktionary examples

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

  1. The Voyager spacecraft explored the solar system and continued into the inestimable space beyond.
  2. He has refused to pass other Laws for the accommodation of large districts of people, unless those people would relinquish the right of Representation in the Legislature, a right inestimable to them and formidable to tyrants only.

Etymology

From Middle French inestimable, from Latin inaestimābilis, from in (“un-”, “not”) + aestimābilis (“estimable”). Equivalent to in- + estimable.

This word in other languages

inappréciable(Français)unschätzbar(Deutsch)

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 "inestimable"?
"inestimable" is spelled I-N-E-S-T-I-M-A-B-L-E. The IPA pronunciation is /ɪˈnɛs.tɪ.mə.bəl/.
What does "inestimable" mean?
As an adjective, "inestimable" means: Not able to be estimated; not able to be calculated, computed or comprehended, as because of great scale, degree or magnitude.
How do you pronounce "inestimable"?
The IPA (International Phonetic Alphabet) transcription for "inestimable" is /ɪˈnɛs.tɪ.mə.bəl/. 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 "inestimable"?
From Middle French inestimable, from Latin inaestimābilis, from in (“un-”, “not”) + aestimābilis (“estimable”). Equivalent to in- + estimable. 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 "inestimable", not the corpus desk frequency band.

Same letter count

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

inferential#81,429historicism#81,406kinesthetic#81,468granulation#81,372

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

Source: FrequencyWords open word-frequency list