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

But the current rush into AI infrastructure — on the promise that Microsoft, Google, or other hyperscalers are rock-solid offtakers— is too rich for CEO Sadek Wahba’s blood. —Liz Hoffman, semafor.com, 21 Oct. 2025

He's built an amazing culture and really a rock-solid foundation. —Alexis Kayser, MSNBC Newsweek, 17 Oct. 2025

For strong resort skiers who want to do it all from bumps to groomers to trees—the Rossignol Arcade W 94 is a rock-solid choice that inspires trust and flow on every run. —Marina Knight, Outside, 17 Oct. 2025

The Appalachian State transfer has been rock-solid for one of the SEC's best offenses. —Chase Goodbread, The Tuscaloosa News, 15 Oct. 2025

Word History

First Known Use

1871, in the meaning defined above

Rhymes for rock-solid

• semisolid
• solid
• squalid
• stolid