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
Easter	EES-tər	English
Aatu	AH:-too	Finnish
Leifur	-	Icelandic
Anar	-	Azerbaijani
Odeta	-	Lithuanian
Cephas	SEE-fəs (English)	Biblical, Biblical Latin