(as) hard as iron

Very hard. I didn't sleep at all last night. The mattress and pillow in the cheap motel were hard as iron. A lifetime of manual labor made the muscles in my father's arms as hard as iron. How am I supposed to knead this dough when it's hard as iron?

See also: hard, iron

See also:

be (as) hard as iron
(as) hard as a rock
(as) hard as stone
hard as a rock
honestly
come by
hard to come by
in the end
not any hard feelings
hard by

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