imperceptible

adj

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

"imperceptible" is a 13-letter English headword indexed on PlainSpell.

The verdict

“imperceptible” is uncommon English (frequency #53,617 among 2,140 “I” headwords), classed as an adjective. The kind of spelling people second-guess.

#53,617
frequency rank, English
2,140
“I” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Not perceptible, not detectable, too small in magnitude to be observed.

Corpus desk

Index EN-imperceptible · imperceptible · English

imperceptible · rank #53,617 · 0 variants · 0 confusables

  • FREQ-RARE #53,617
  • LEN-MEGA 13 letters
  • VOW-5 5 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-MID 2,140
  • PHOTO-FINISH impregnate

Nearest frequency peer: impregnate (+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 “imperceptible”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

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

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for imperceptible
PropertyValue
Headwordimperceptible
LanguageEnglish
Part of speechAdjective
Letters13
Frequency rank#53,617
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “imperceptible” in English

Word frequency stretches from the small set of words we reach for constantly (left) out to the long tail barely used once in a while (right).imperceptiblefalls 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: “impregnate” (#53,618), “IAF” (#53,614), “industrially” (#53,620). Among 2,140 “I” headwords, “imperceptible” is #53,617. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

imperceptible is uncommon English at frequency #53,617 among 2,140 “I” headwords, classed as anadjective. Rarity is why readers land here mid-draft. 2 senses are on record.

No generated misspelling entries exist for imperceptible in our index, suggesting the orthography follows predictable English patterns. This headword has no recorded confusable partner, which usually means its spelling is distinct enough that readers don't reach for a similar-looking word instead.

Etymologically, the entry records: Inherited from Middle English imperceptible, from Middle French imperceptible and its etymon Medieval Latin imperceptibilis. By surface analysis, im- + perceptible. The correct English form is imperceptible, spelled I-M-P-E-R-C-E-P-T-I-B-L-E.

Definition

  1. 1
    Not perceptible, not detectable, too small in magnitude to be observed.
  2. 2
    Beyond the purview of man; too great and all-encompassing to be perceived.

Recorded use

Wiktionary examples

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

  1. We all missed the imperceptible shake of his head as he tried to warn us without being seen.
  2. For this ſtone may have naturally grown into this very ſhape, and the ſeeming aſhes may be no aſhes, that is no remainders of any ſewell burnt there, but ſome unexplicable and imperceptible Motions of the Aire, or other particles of this fluid Matter that is active every where, have wrought ſome parts of the Matter into the form and nature of aſhes, and h…

Etymology

Inherited from Middle English imperceptible, from Middle French imperceptible and its etymon Medieval Latin imperceptibilis. By surface analysis, im- + perceptible.

Synonyms

imperceivableimperceptibleinsensibleundetectableundistinguishableunperceivable

Antonyms

perceptible

This word in other languages

imperceptible(Español)imperceptible(Français)unmerklich(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 "imperceptible"?
"imperceptible" is spelled I-M-P-E-R-C-E-P-T-I-B-L-E.
What does "imperceptible" mean?
As an adjective, "imperceptible" means: Not perceptible, not detectable, too small in magnitude to be observed.
What is the origin of the word "imperceptible"?
Inherited from Middle English imperceptible, from Middle French imperceptible and its etymon Medieval Latin imperceptibilis. By surface analysis, im- + perceptible. 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 "imperceptible", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 13 letters (nearest by frequency rank).

expeditiously#53,530mycobacterium#53,721overstatement#53,756symmetrically#53,899

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

Source: FrequencyWords open word-frequency list