hard as a rock

*hard as a rock

and *hard as stone

very hard. (*Also: as ∼.) This cake is as hard as a rock! I can't drive a nail into this wood. It's hard as stone.

Name	Pronounced	Usage
Gordana	GOR-dah-nah (Serbian, Croatian)	Serbian, Croatian, Macedonian
WŁOdek	VWAW-dek	Polish
Courtney	KORT-nee	English
Magnus	MAHNG-nus (Swedish), MAG-nəs (English)	Swedish, Norwegian, Danish, Late Roman
KrzyŚ	KZHISH	Polish
Regan	['ri:gən]