imperturbable
/ˌɪmpəˈtɜːbəbl̩/
"imperturbable" is a 13-letter English headword indexed on PlainSpell.
The verdict
“imperturbable” is outside the top-ranked English vocabulary, used as an adjective - the kind of word writers most often double-check.
- Unranked
- below top-frequency English
- 13
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Not capable of being, or not easily, perturbed, excited, or upset; calm and collected, even under pressure.
| Property | Value |
|---|---|
| Headword | imperturbable |
| Language | English |
| Part of speech | Adjective |
| IPA | /ˌɪmpəˈtɜːbəbl̩/ |
| Letters | 13 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “imperturbable” sits in English frequency
Spelling & Dictionary Insight
The English entry for imperturbable is 13 letters long, classified as an adjective, and transcribed in the International Phonetic Alphabet as /ˌɪmpəˈtɜːbəbl̩/. It sits outside the most-frequent rank tiers, which is often why uncommon words generate more spelling variants per reader. The dominant gloss from Wiktionary reads: "Not capable of being, or not easily, perturbed, excited, or upset; calm and collected, even under pressure.".
Our edit-distance generator produced no likely misspellings for imperturbable, suggesting the orthography follows predictable English patterns. No close-neighbour confusable shows up for this headword in our dataset, suggesting its spelling stands apart enough that readers rarely confuse it with something else.
Etymologically, the entry records: PIE word *né From Late Middle English imperturbable (“undisturbed; impossible to disturb”), borrowed from Late Latin imperturbābilis, from Latin im- (variant of in- (prefix meaning ‘not’)) + Late Latin perturbabilis (“perturbable”) (from Latin perturbō (“t… The correct English form is imperturbable, spelled I-M-P-E-R-T-U-R-B-A-B-L-E.
Definition
- 1Not capable of being, or not easily, perturbed, excited, or upset; calm and collected, even under pressure.
Etymology
PIE word *né From Late Middle English imperturbable (“undisturbed; impossible to disturb”), borrowed from Late Latin imperturbābilis, from Latin im- (variant of in- (prefix meaning ‘not’)) + Late Latin perturbabilis (“perturbable”) (from Latin perturbō (“to confuse; to alarm, disturb, trouble, perturb”) + -bilis (suffix forming adjectives denoting a capacity or worth of being acted upon)). Perturbō is derived from per- (intensifying prefix) + turbō (“to agitate, disturb, unsettle, perturb; to upset”) (from turba (“disorder, disturbance, turmoil”) (possibly from Ancient Greek τῠ́ρβη (tŭ́rbē, “confusion, disorder, tumult”), either from Pre-Greek, or Proto-Indo-European *(s)twerH- (“to agitate, stir up; to urge on, propel”)) + -ō (suffix forming infinitives of regular first-conjugation verbs)). By surface analysis, im- (prefix meaning ‘not’) + perturbable.
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). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “imperturbable”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is I-M-P-E-R-T-U-R-B-A-B-L-E - every other letter order is a misspelling in standard orthography.
- Say it as /ˌɪmpəˈtɜːbəbl̩/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- 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.