# unsub

> English word · Noun · IPA /ˈʌnsʌb/ · frequency rank #56,511

## Definitions
1. Abbreviation of unknown subject of an investigation..

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