# deadliness

> English word · Noun · IPA /ˈdɛdlɪnəs/

## Definitions
1. Synonym of lethality.
2. Synonym of lethality.
3. Tedium, or the quality of being boring.

## Etymology
From Middle English dedlinesse, deadlicnesse, from Old English dēadlīcnes, equivalent to deadly + -ness.

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