# undecided vs undefined

> English confusable word pair

## The two words

### undecided
*adjective · frequency rank #22,536*
Open and not yet settled or determined.

### undefined
*adjective · frequency rank #27,687*
Lacking a definition or value.

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