# sad vs SI

> English confusable word pair

## The two words

### sad
*adjective · IPA /ˈsæd/ · frequency rank #1,536*
Emotionally negative.

### SI
*name · frequency rank #5,453*
International System of Units

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/vs/sad-vs-si