# faithful

> English word · Adjective · IPA /ˈfeɪθ.fl̩/ · frequency rank #6,050

## Definitions
1. Loyal; adhering firmly to person or cause.
2. Having faith.
3. Reliable; worthy of trust.
4. Consistent with reality.
5. Engaging in sexual relations only with one's spouse or long-term sexual partner.
6. Injective in specific contexts, e.g. of representations in representation or functors in category theory.
7. Of a module, whose annihilator is zero.

## Etymology
From Middle English feithful, equivalent to faith + -ful.

## Easily confused with
- **fateful** (https://plainspell.com/en/vs/faithful-vs-fateful)
- **faithfully** (https://plainspell.com/en/vs/faithful-vs-faithfully)

## Common misspellings (12)
`afithful`, `faihtful`, `faitfhul`, `faithfful`, `faithflu`, `faithfull`, `faithhful`, `faithufl`, `faitthful`, `fatihful`, `ffaithful`, `fiathful`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/faithful