insufficient

/ɪnsəˈfɪʃənt/

//ɪnsəˈfɪʃənt// det

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

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

The verdict

“insufficient” has 16 generated spelling variants in the English index at frequency #10,067. The variants make it a useful spelling check.

#10,067
frequency rank, English
2,140
“I” headwords
16
tracked misspellings
3
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - An inadequate quantity of; not enough.

Corpus desk

Index EN-insufficient · insufficient · English

insufficient · rank #10,067 · 16 variants · 3 confusables

  • FREQ-MID #10,067
  • LEN-MEGA 12 letters
  • VOW-5 5 vowels
  • CONFUS-LOW 3 pairs
  • VAR-HIGH 16 variants
  • BOOK-MID 2,140
  • PHOTO-FINISH insider

Nearest frequency peer: insider (-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 “insufficient”

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

corpus weight

What this shows “insufficient” 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).

insufficient vs insufficiently
86% similar
insufficient vs inefficient
83% similar
insufficient vs insufficiency
85% similar

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

Key facts for insufficient
PropertyValue
Headwordinsufficient
LanguageEnglish
Part of speechDeterminer
IPA/ɪnsəˈfɪʃənt/
Letters12
Frequency rank#10,067
Misspellings tracked16
Confusable pairs3
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “insufficient”

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).insufficientlands 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 “insider” (#10,066), “interval” (#10,068), “incumbent” (#10,065). Among 2,140 “I” headwords, “insufficient” is #10,067. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 16 spelling variants around insufficient (IPA /ɪnsəˈfɪʃənt/), adeterminer. Corpus frequency is #10,067 among 2,140 “I” headwords. Wiktionary lists 2 senses, so context still picks the gloss.

Our generated misspelling index lists 16 likely wrong-spelling variants for insufficient, with forms such as "innsufficient", "insfuficient", and "inssufficient". 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 3 confusable-pair relationships, "insufficiently", "inefficient", "insufficiency", a pairing that trips writers up because the two words share enough sound or shape to blur together.

Etymologically, the entry records: From Middle French insufficient, from Latin insufficiens. See also in- + sufficient. The correct English form is insufficient, spelled I-N-S-U-F-F-I-C-I-E-N-T.

Definition

  1. 1
    An inadequate quantity of; not enough.
  2. 2
    A quantity (of something) that is less than is needed.

Recorded use

Wiktionary examples

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

  1. Insufficient time is available to reflect on the problem.
  2. Insufficient of the building remains to determine its age.

Etymology

From Middle French insufficient, from Latin insufficiens. See also in- + sufficient.

Common misspellings

Also misspelled as:

  • innsufficient
  • insfuficient
  • inssufficient
  • insuffciient
  • insufficcient
  • insufficeint
  • insufficiennt
  • insufficientt
  • insufficietn
  • insufficinet
  • insuffiicent
  • insuficient
  • insufifcient
  • inusfficient
  • isnufficient
  • nisufficient

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of insufficient - 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.

innsufficient1insfuficient2inssufficient1insuffciient2insufficcient1insufficeint2insufficiennt1insufficientt1
Edit distance from "insufficient"

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 "insufficient"?
"insufficient" is spelled I-N-S-U-F-F-I-C-I-E-N-T. The IPA pronunciation is /ɪnsəˈfɪʃənt/.
What does "insufficient" mean?
As a determiner, "insufficient" means: An inadequate quantity of; not enough.
What words are commonly confused with "insufficient"?
"insufficient" is commonly confused with "insufficiently", "inefficient", "insufficiency". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "insufficient"?
The IPA (International Phonetic Alphabet) transcription for "insufficient" is /ɪnsəˈfɪʃənt/. 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 "insufficient"?
From Middle French insufficient, from Latin insufficiens. See also in- + sufficient. 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 "insufficient", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 12 letters (nearest by frequency rank).

modification#10,088neighbouring#10,092cancellation#10,174questionable#9,945

Similar misspelling depth

Headwords with a similar count of attested misspellings (16 here; floor ≥5).

delightful16 variantscomplement16 variantscomparative16 variantsremarkably16 variants

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

Source: FrequencyWords open word-frequency list