inefficient

/ˌɪn.ɪˈfɪʃ.ənt/

//ˌɪn.ɪˈfɪʃ.ənt// adj

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

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

The verdict

“inefficient” has 14 generated spelling variants in the English index at frequency #15,838. The variants make it a useful spelling check.

#15,838
frequency rank, English
2,140
“I” headwords
14
tracked misspellings
2
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Not efficient; not producing the effect intended or desired; inefficacious.

Corpus desk

Index EN-inefficient · inefficient · English

inefficient · rank #15,838 · 14 variants · 2 confusables

  • FREQ-MID #15,838
  • LEN-MEGA 11 letters
  • VOW-5 5 vowels
  • CONFUS-LOW 2 pairs
  • VAR-HIGH 14 variants
  • BOOK-MID 2,140
  • PHOTO-FINISH initials

Nearest frequency peer: initials (+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.

Rank peers near misspelling magnet “inefficient”

Same rarity band: useful when a typo lands on a peer headword

corpus weight

What this shows “inefficient” sits among these FrequencyWords peers; misspelling depth is tracked separately in the edit-distance chart.

Source FrequencyWords open word-frequency list As of September 3, 2026

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

inefficient vs insufficient
83% similar
inefficient vs inefficiency
83% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for inefficient
PropertyValue
Headwordinefficient
LanguageEnglish
Part of speechAdjective
IPA/ˌɪn.ɪˈfɪʃ.ənt/
Letters11
Frequency rank#15,838
Misspellings tracked14
Confusable pairs2
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “inefficient”

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).inefficientlands here:

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

The axis is logarithmic, with each marked tick roughly ten times rarer than the last. Same rarity band neighbours include “initials” (#15,839), “immoral” (#15,836), “instrumentation” (#15,840). Among 2,140 “I” headwords, “inefficient” is #15,838. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 14 spelling variants around inefficient (IPA /ˌɪn.ɪˈfɪʃ.ənt/), anadjective. Corpus frequency is #15,838 among 2,140 “I” headwords. Wiktionary lists 2 senses, so context still picks the gloss.

Our generated misspelling index lists 14 likely wrong-spelling variants for inefficient, with forms such as "ienfficient", "ineffciient", and "inefficcient". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. It also participates in 2 confusable-pair relationships, "insufficient", "inefficiency", where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: From in- + efficient. The correct English form is inefficient, spelled I-N-E-F-F-I-C-I-E-N-T.

Definition

  1. 1
    Not efficient; not producing the effect intended or desired; inefficacious.
  2. 2
    Incapable of, or indisposed to, effective action; habitually slack or unproductive; effecting little or nothing.

Recorded use

Wiktionary examples

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

  1. Celery is an inefficient food.
  2. inefficient workers

Etymology

From in- + efficient.

Antonyms

efficient

This word in other languages

inefficace(Français)ineficiente(Português)

Common misspellings

Also misspelled as:

  • ienfficient
  • ineffciient
  • inefficcient
  • inefficeint
  • inefficiennt
  • inefficientt
  • inefficietn
  • inefficinet
  • ineffiicent
  • ineficient
  • inefifcient
  • infeficient
  • innefficient
  • niefficient

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of inefficient - counted as single-character edits (an insertion, a deletion, or a substituted letter). The larger the bar, the easier the typo is to spot; one-edit slips are the ones that sneak past readers.

ienfficient2ineffciient2inefficcient1inefficeint2inefficiennt1inefficientt1inefficietn2inefficinet2
Edit distance from "inefficient"

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 "inefficient"?
"inefficient" is spelled I-N-E-F-F-I-C-I-E-N-T. The IPA pronunciation is /ˌɪn.ɪˈfɪʃ.ənt/.
What does "inefficient" mean?
As an adjective, "inefficient" means: Not efficient; not producing the effect intended or desired; inefficacious.
What words are commonly confused with "inefficient"?
"inefficient" is commonly confused with "insufficient", "inefficiency". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "inefficient"?
The IPA (International Phonetic Alphabet) transcription for "inefficient" is /ˌɪn.ɪˈfɪʃ.ənt/. 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 "inefficient"?
From in- + efficient. 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 "inefficient", not the corpus desk frequency band.

Same letter count

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

illustrator#15,834intolerance#15,842humiliating#15,831convergence#15,788

Similar misspelling depth

Headwords with a similar count of attested misspellings (14 here; floor ≥5).

imbalance14 variantshorrifying14 variantsgraphical14 variantsflattering14 variants

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

Source: FrequencyWords open word-frequency list