indefectible

/ɪndɪˈfɛktɪbəl/

//ɪndɪˈfɛktɪbəl// adj

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

"indefectible" is a 12-letter English headword indexed on PlainSpell.

The verdict

“indefectible” 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
12
letters

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Having the ability to resist defect or failure, permanent, lasting.

Key facts for indefectible
PropertyValue
Headwordindefectible
LanguageEnglish
Part of speechAdjective
IPA/ɪndɪˈfɛktɪbəl/
Letters12
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Where “indefectible” sits in English frequency

indefectible falls outside the top-100,000 ranked English words, the long-tail zone of technical, archaic, or low-frequency vocabulary, exactly where readers second-guess spellings most.

Beyond rank #100,000. Source: FrequencyWords open word-frequency list.

Spelling & Dictionary Insight

The English entry for indefectible is 12 letters long, classified as an adjective, and transcribed in the International Phonetic Alphabet as /ɪndɪˈfɛktɪbəl/. It sits outside the most-frequent rank tiers, which is often why uncommon words generate more spelling variants per reader. Wiktionary records 2 distinct senses for this headword, so context determines which meaning a reader should apply.

No generated misspelling entries exist for indefectible in our index, a straightforward case of a spelling with little room for common typos. We don't track a confusable pairing for this entry, since its spelling is unusual enough that it doesn't cluster with a lookalike.

Etymologically, the entry records: From in- + defect + -ible. The correct English form is indefectible, spelled I-N-D-E-F-E-C-T-I-B-L-E.

Definition

  1. 1
    Having the ability to resist defect or failure, permanent, lasting.
  2. 2
    Without flaw or defect, perfect.

Etymology

From in- + defect + -ible.

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

How do you spell "indefectible"?
"indefectible" is spelled I-N-D-E-F-E-C-T-I-B-L-E. The IPA pronunciation is /ɪndɪˈfɛktɪbəl/.
What does "indefectible" mean?
As an adjective, "indefectible" means: Having the ability to resist defect or failure, permanent, lasting.
How do you pronounce "indefectible"?
The IPA (International Phonetic Alphabet) transcription for "indefectible" is /ɪndɪˈfɛktɪbəl/. 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 "indefectible"?
From in- + defect + -ible. 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.

Using “indefectible”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is I-N-D-E-F-E-C-T-I-B-L-E - every other letter order is a misspelling in standard orthography.
  • Say it as /ɪndɪˈfɛktɪbəl/ (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.

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

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list