as hard as marble
 

* 1.very hard

English Related Words* a hard act to follow

* a hard case

* a hard day

* a hard nut to crack

* a hard row to hoe

* a hard time

* agate marble tissue paper

* andaman marble

* artificial marble

* as cold as marble

* as hard as

* as hard as he could

* as hard as iron

* as hard as stone

* battle hard