foolproof

Name: foolproof, English Word Data
Creator: Wiktionary
License: https://creativecommons.org/licenses/by-sa/4.0/

/ˈfuːl ˌpɹuːf/

//ˈfuːl ˌpɹuːf// adj

By PlainSpell · According to Wiktionary data (CC BY-SA) · analyzed September 3, 2026

The verdict

“foolproof” has 13 generated spelling variants in the English index at frequency #34,062. The variants make it a useful spelling check.

#34,062
frequency rank, English: 2,507
“F” headwords: 13
tracked misspellings

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Of a device: protected against, or designed to be proof against, misuse or error.

Corpus desk

Index EN-foolproof · foolproof · English

foolproof · rank #34,062 · 13 variants · 0 confusables

FREQ-MID #34,062
LEN-LONG 9 letters
VOW-4 4 vowels
CONFUS-0 No pairs
VAR-HIGH 13 variants
BOOK-MID 2,507
PHOTO-FINISH followup

Nearest frequency peer: followup (-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.

Fleury

65,942
flotilla

65,941
followup

65,940
foolproof

65,939
footballing

65,938
forgetful

65,937

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

Key facts for foolproof
Property	Value
Headword	foolproof
Language	English
Part of speech	Adjective
IPA	/ˈfuːl ˌpɹuːf/
Letters	9
Frequency rank	#34,062
Misspellings tracked	13
Confusable pairs	0
Source	Wiktionary (kaikki.org)

Frequency seat of misspelling magnet “foolproof”

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).foolprooflands here:

#34,062

#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 “followup” (#34,061), “footballing” (#34,063), “flotilla” (#34,060). Among 2,507 “F” headwords, “foolproof” is #34,062. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 13 spelling variants around foolproof (IPA /ˈfuːl ˌpɹuːf/), anadjective. Corpus frequency is #34,062 among 2,507 “F” headwords. Wiktionary lists 2 senses, so context still picks the gloss.

Our generated misspelling index lists 13 likely wrong-spelling variants for foolproof, with forms such as "ffoolproof", "foloproof", and "folproof". Each of these forms differs from the correct spelling by one small edit: a doubled letter, a dropped silent letter, or a substituted vowel. We don't track a confusable pairing for this entry, suggesting its spelling stands apart enough that readers rarely confuse it with something else.

Etymologically, the entry records: From fool + -proof. The correct English form is foolproof, spelled F-O-O-L-P-R-O-O-F.

Definition

1
Of a device: protected against, or designed to be proof against, misuse or error.
2
Of an idea or plan: certain to succeed in all eventualities, or claimed to be so; infallible.

Recorded use

Wiktionary examples

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

My foolproof recipe is my gâteau fermière.
From Nigella Lawson’s effortless spaghetti with Marmite to Chetna Makan’s foolproof chicken curry – the recipes to turn to when you want easy but tasty suppers

Etymology

From fool + -proof.

This word in other languages

seguro(Español)infaillible(Français)narrensicher(Deutsch)

Common misspellings

Also misspelled as:

ffoolproof
foloproof
folproof
foollproof
foolporof
foolpproof
foolprof
foolprofo
foolprooff
foolprroof
foolrpoof
fooplroof
ofolproof

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of foolproof - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.

Edit distance from "foolproof"

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 "foolproof"?

"foolproof" is spelled F-O-O-L-P-R-O-O-F. The IPA pronunciation is /ˈfuːl ˌpɹuːf/.

What does "foolproof" mean?

As an adjective, "foolproof" means: Of a device: protected against, or designed to be proof against, misuse or error.

What are common misspellings of "foolproof"?

Common misspellings include "ffoolproof", "foloproof", "folproof", "foollproof", "foolporof". The correct spelling is "foolproof".

How do you pronounce "foolproof"?

The IPA (International Phonetic Alphabet) transcription for "foolproof" is /ˈfuːl ˌpɹuːf/. 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 "foolproof"?

From fool + -proof. 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 "foolproof", not the corpus desk frequency band.

Same letter count

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

forgetful#34,064 firehouse#34,056 gallantry#34,071 governess#34,084

Similar misspelling depth

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

forklift13 variants gravitate13 variants gunfight13 variants Hongkong13 variants