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
PÉTur	-	Icelandic
Natisha	-	African American (Rare)
Jagannath	-	Indian, Hindi
Manfried	MAHN-freet	German
Kathrine	-	Danish, Norwegian
Thi	-	Vietnamese