English

Adjective

as solid as a rock ‎(not comparable)

1. (simile) Extremely thick and heavy, so as to make it impossible to move.

   We're not going to be able to break down this door, it's solid as a rock.

2. (simile, of a person) Very reliable and dependable

   Stewart has been solid as a rock ever since becoming the new vice-chairman.

Synonyms

• (thick and heavy): rock-solid
• (reliable and dependable): rock-solid