insufficient
/ɪnsəˈfɪʃənt/
"insufficient" is a 12-letter English headword indexed on PlainSpell.
The verdict
“insufficient” is a moderately-common English word, ranked #10,067 in English word frequency and used as a determiner.
- #10,067
- frequency rank, English
- 12
- letters
- 16
- tracked misspellings
- 3
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - An inadequate quantity of; not enough.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | insufficient |
| Language | English |
| Part of speech | Determiner |
| IPA | /ɪnsəˈfɪʃənt/ |
| Letters | 12 |
| Frequency rank | #10,067 |
| Misspellings tracked | 16 |
| Confusable pairs | 3 |
| Source | Wiktionary (kaikki.org) |
Where “insufficient” sits in English frequency
Spelling & Dictionary Insight
The English entry for insufficient is 12 letters long, classified as a determiner, and transcribed in the International Phonetic Alphabet as /ɪnsəˈfɪʃənt/. Corpus data places it at rank #10,067 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 2 distinct senses for this headword, so context determines which meaning a reader should apply.
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
- 1An inadequate quantity of; not enough.
- 2A quantity (of something) that is less than is needed.
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.
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"?
What does "insufficient" mean?
What words are commonly confused with "insufficient"?
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Using “insufficient”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is I-N-S-U-F-F-I-C-I-E-N-T - every other letter order is a misspelling in standard orthography.
- Say it as /ɪnsəˈfɪʃənt/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Don't mix it up with “insufficiently” - see the side-by-side comparison. insufficient vs insufficiently
- 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.