# undefined

> English word · Adjective · frequency rank #27,687

## Definitions
1. Lacking a definition or value.
2. That does not have a meaning and is thus not assigned an interpretation.

## Etymology
From un- + defined.

## Easily confused with
- **underlined** (https://plainspell.com/en/vs/undefined-vs-underlined)
- **undecided** (https://plainspell.com/en/vs/undecided-vs-undefined)

## Common misspellings (13)
`nudefined`, `udnefined`, `unddefined`, `undeffined`, `undefiend`, `undefinde`, `undefinedd`, `undefinned`, `undefnied`, `undeifned`, `undfeined`, `unedfined`, `unndefined`

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