rock-solid

adjective

rock-sol·​id ˈräk-ˈsä-ləd 

variants or rock solid

: completely or perfectly solid (as because of great strength or dependability)

supported by a rock-solid foundation

She has a rock-solid reputation.

Their relationship was rock solid.

… she moved in an artificial world without ever losing her rock-solid integrity.

—Walter Clemons

He is right to imply that the political structure is a little shaky—it was a myth that it was ever rock solid.

—Xan Smiley

Examples of rock-solid in a Sentence

Recent Examples on the Web

The early internet didn’t start with clean user experiences or rock-solid standards. —Wesley Crook, Forbes.com, 5 June 2025

Both are rock-solid performers with deep catalogs from which to draw. —George Varga, San Diego Union-Tribune, 30 May 2025

What kind of rock-solid principles keeps them on the straight and narrow that balance that's so hard for everyone alive? —EW.com, 26 May 2025

Tiberius’ innovation pipeline of products and services is engineered to catalyze a strategic leap in defense – empowering the UK, the US and their allies with unmatched agility, precision and rock-solid resilience. —New Atlas, 21 May 2025

Word History

First Known Use

1871, in the meaning defined above

Rhymes for rock-solid

• semisolid
• solid
• squalid
• stolid