---
title: "BIP39 Word #669: fatal — Seed Phrase Mnemonic Word"
url: "https://bip39-phrase.com/bip39-word/fatal/"
language: "en"
updated: "2026-10-19T00:00:00+00:00"
---

Word #669 01010011100 

# fatal — BIP39 word #669

"**fatal**" is word #669 of the 2048 words in the official BIP39 English wordlist, between [fat](/bip39-word/fat/) and [father](/bip39-word/father/). In a seed phrase it stands for the 11-bit value `01010011100`, decimal index 668\. 

/ˈfeɪtl/  · _adjective:_ causing death, or leading to failure or disaster 

[Russian](/ru/ "The BIP39 wordlist with Russian translations"): фатальный 

## Binary Representation

Five 1-bits and six 0-bits; 462 of the 2048 indexes have exactly five 1-bits.

One wrong bit turns it into (leftmost bit first):

[squeeze](/bip39-word/squeeze/)[bean](/bip39-word/bean/)[inform](/bip39-word/inform/)[drum](/bip39-word/drum/)[fortune](/bip39-word/fortune/)[fiscal](/bip39-word/fiscal/)[face](/bip39-word/face/)[family](/bip39-word/family/)[fantasy](/bip39-word/fantasy/)[fatigue](/bip39-word/fatigue/)[father](/bip39-word/father/) 

Position

Hex Index

0x29C

4-Letter Prefix

fata

## About "fatal" in BIP39

- "fatal" has 5 letters, but the first four, **"fata"**, already identify it, because **"fat"** also begins [fat](/bip39-word/fat/), [father](/bip39-word/father/) and [fatigue](/bip39-word/fatigue/).
- Its first letters also spell another BIP39 word, [fat](/bip39-word/fat/). Write "fatal" out in full: cut short, it turns into a different valid word.
- The same spelling is in the [French BIP39 wordlist](/french/), but as word #796 (index 795), not #669\. A wallet set to French reads "fatal" as **01100011011** instead of **01010011100**, and decodes index 668 as "enduire".
- "fatal" appears in one of the 24 official English [test vectors](https://github.com/trezor/python-mnemonic/blob/master/vectors.json) of BIP39: vector #20 (word 12 of 18). Every official vector passes the [checksum checker](/bip39-checksum-checker/), and [How BIP39 works](/how-bip39-works/) shows how the entropy turns into such words.

Official test vector #20

[light](/bip39-word/light/) [rule](/bip39-word/rule/) [cinnamon](/bip39-word/cinnamon/) [wrap](/bip39-word/wrap/) [drastic](/bip39-word/drastic/) [word](/bip39-word/word/) [pride](/bip39-word/pride/) [squirrel](/bip39-word/squirrel/) [upgrade](/bip39-word/upgrade/) [then](/bip39-word/then/) [income](/bip39-word/income/) fatal [apart](/bip39-word/apart/) [sustain](/bip39-word/sustain/) [crack](/bip39-word/crack/) [supply](/bip39-word/supply/) [proud](/bip39-word/proud/) [access](/bip39-word/access/) 

## Word #669 in the Other 9 BIP39 Wordlists

[Czech](/czech/) kralovat 

[French](/french/) enduire 

[Italian](/italian/) fluente 

[Japanese](/japanese/) こぼれる 

[Korean](/korean/) 본격적 

[Portuguese](/portuguese/) elaborar 

[Spanish](/spanish/) exponer 

[Traditional Chinese](/chinese-traditional/) 獨 

[Simplified Chinese](/chinese-simplified/) 独 

## Similar Words — Check Carefully During Recovery

Words sharing the first three letters "fat":

[fat](/bip39-word/fat/)[father](/bip39-word/father/)[fatigue](/bip39-word/fatigue/) 

## More BIP39 Words Starting with "F"

[ #665 fantasy ](/bip39-word/fantasy/)[ #666 farm ](/bip39-word/farm/)[ #667 fashion ](/bip39-word/fashion/)[ #668 fat ](/bip39-word/fat/)[ #670 father ](/bip39-word/father/)[ #671 fatigue ](/bip39-word/fatigue/)[ #672 fault ](/bip39-word/fault/)[ #673 favorite ](/bip39-word/favorite/) 

[View all words starting with "F" ](/bip39-words/f/) 

## Seed phrase, key and recovery guides

- [TON Seed Phrase: 24-Word Format vs 12-Word BIP39 Phrases](/seed-phrase-format-for-ton-wallets/)
- [Recover Lost Bitcoin: Find Wallet Backups and Seed Phrases](/recover-lost-bitcoin-find-wallet-backups/)
- [Seed Phrase vs Private Key: What's the Difference?](/seed-phrase-vs-private-key/)

[ Full BIP39 Wordlist ](/)