deficient

/dɪˈfɪʃənt/

//dɪˈfɪʃənt// adj

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

"deficient" is a 9-letter English headword indexed on PlainSpell.

The verdict

“deficient” has 13 generated spelling variants in the English index at frequency #18,801. The variants make it a useful spelling check.

#18,801
frequency rank, English
3,470
“D” headwords
13
tracked misspellings
2
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Lacking something essential; often construed with in.

Corpus desk

Index EN-deficient · deficient · English

deficient · rank #18,801 · 13 variants · 2 confusables

  • FREQ-MID #18,801
  • LEN-LONG 9 letters
  • VOW-4 4 vowels
  • CONFUS-LOW 2 pairs
  • VAR-HIGH 13 variants
  • BOOK-MID 3,470
  • PHOTO-FINISH dashboard

Nearest frequency peer: dashboard (-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 “deficient”

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

corpus weight

What this shows “deficient” 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).

deficient vs deficit
78% similar
deficient vs deficiency
80% similar

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

Key facts for deficient
PropertyValue
Headworddeficient
LanguageEnglish
Part of speechAdjective
IPA/dɪˈfɪʃənt/
Letters9
Frequency rank#18,801
Misspellings tracked13
Confusable pairs2
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “deficient”

This scale runs from the tiny cluster of words that carry ordinary speech (left) to the long tail of words almost nobody reaches for (right).deficientlands here:

#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. Same rarity band neighbours include “dashboard” (#18,800), “degenerate” (#18,802), “demonic” (#18,803). Among 3,470 “D” headwords, “deficient” is #18,801. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 13 spelling variants around deficient (IPA /dɪˈfɪʃənt/), anadjective. Corpus frequency is #18,801 among 3,470 “D” headwords. Wiktionary lists 3 senses, so context still picks the gloss.

Our generated misspelling index lists 13 likely wrong-spelling variants for deficient, with forms such as "ddeficient", "defciient", and "defficient". Each variant is a distinct typo pattern an edit-distance generator flags, typically a doubled-consonant error, a silent-letter drop, or a vowel substitution. It also participates in 2 confusable-pair relationships, "deficit", "deficiency", since the words sound or look close enough that writers reach for the wrong one mid-sentence.

Etymologically, the entry records: From Latin deficiens, present participle of deficere (“to lack, fail, be wanting”); see defect. The correct English form is deficient, spelled D-E-F-I-C-I-E-N-T.

Definition

  1. 1
    Lacking something essential; often construed with in.
  2. 2
    Insufficient or inadequate in amount.
  3. 3
    Of a number n, Having the sum of divisors σ(n)<2n, or, equivalently, the sum of proper divisors (or aliquot sum) s(n)<n.

Recorded use

Wiktionary examples

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

  1. They were deficient in social skills.
  2. Apothecia lecanoroid; multilocular; each cell containing a single theke; paraphyses deficient.

Etymology

From Latin deficiens, present participle of deficere (“to lack, fail, be wanting”); see defect.

This word in other languages

deficiente(Español)mangelhaft(Deutsch)deficiente(Português)

Common misspellings

Also misspelled as:

  • ddeficient
  • defciient
  • defficient
  • deficcient
  • deficeint
  • deficiennt
  • deficientt
  • deficietn
  • deficinet
  • defiicent
  • deifcient
  • dfeicient
  • edficient

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of deficient - expressed in single-character edits (insert, delete, or swap one letter). Bigger bars stand out at a glance; a one-edit slip is the hardest to catch.

ddeficient1defciient2defficient1deficcient1deficeint2deficiennt1deficientt1deficietn2
Edit distance from "deficient"

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 "deficient"?
"deficient" is spelled D-E-F-I-C-I-E-N-T. The IPA pronunciation is /dɪˈfɪʃənt/.
What does "deficient" mean?
As an adjective, "deficient" means: Lacking something essential; often construed with in.
What words are commonly confused with "deficient"?
"deficient" is commonly confused with "deficit", "deficiency". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "deficient"?
The IPA (International Phonetic Alphabet) transcription for "deficient" is /dɪˈfɪʃənt/. 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 "deficient"?
From Latin deficiens, present participle of deficere (“to lack, fail, be wanting”); see defect. 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 "deficient", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 9 letters (nearest by frequency rank).

dashboard#18,800deterrent#18,804excursion#18,818centrally#18,783

Similar misspelling depth

Headwords with a similar count of attested misspellings (13 here; floor ≥5).

circling13 variantsFlanders13 variantsintrusive13 variantsJosephine13 variants

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

Source: FrequencyWords open word-frequency list