# rock hard

> English word · Adjective

## Definitions
1. As tough, hard, or inflexible as a piece of rock.
2. With muscles developed and toned to a high degree, especially the muscles of the abdomen.
3. Having a very fully erect and stiff penis
4. With strongly held beliefs and opinions, deep conviction.

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