unperturbed

adj

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

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

The verdict

“unperturbed” is uncommon English (frequency #63,340 among 1,433 “U” headwords), classed as an adjective. The kind of spelling people second-guess.

#63,340
frequency rank, English
1,433
“U” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Not perturbed.

Corpus desk

Index EN-unperturbed · unperturbed · English

unperturbed · rank #63,340 · 0 variants · 0 confusables

  • FREQ-RARE #63,340
  • LEN-MEGA 11 letters
  • VOW-4 4 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-MID 1,433
  • PHOTO-FINISH unforeseeable

Nearest frequency peer: unforeseeable (-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 “unperturbed”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

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

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for unperturbed
PropertyValue
Headwordunperturbed
LanguageEnglish
Part of speechAdjective
Letters11
Frequency rank#63,340
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “unperturbed” 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).unperturbedfalls in this rarity band:

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

Ticks step logarithmically, so each one marks a roughly tenfold drop in how often the word turns up. Rare peers in the same band: “unforeseeable” (#63,339), “upstage” (#63,341), “undervalue” (#63,338). Among 1,433 “U” headwords, “unperturbed” is #63,340. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

unperturbed is uncommon English at frequency #63,340 among 1,433 “U” headwords, classed as anadjective. Rarity is why readers land here mid-draft. Gloss: "Not perturbed.".

unperturbed doesn't appear in our generated misspelling index, and the word's spelling is regular enough that our generator found nothing worth flagging. Our confusable-pair dataset has no match for it, which usually means its spelling is distinct enough that readers don't reach for a similar-looking word instead.

Etymologically, the entry records: From un- + perturbed. The correct English form is unperturbed, spelled U-N-P-E-R-T-U-R-B-E-D.

Definition

  1. 1
    Not perturbed.

Etymology

From un- + perturbed.

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 "unperturbed"?
"unperturbed" is spelled U-N-P-E-R-T-U-R-B-E-D.
What does "unperturbed" mean?
As an adjective, "unperturbed" means: Not perturbed.
What is the origin of the word "unperturbed"?
From un- + perturbed. 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 "unperturbed", not the corpus desk frequency band.

Same letter count

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

uncompleted#63,334uncollected#63,333watercourse#63,362Westmorland#63,367

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

Source: FrequencyWords open word-frequency list