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

Thanks to a world-class performance from a 40-year-old goalkeeper and a rock-solid Cape Verde defense, the African nation emerged overjoyed despite a draw. — Ainsley Flood, CNN Money, 2 Aug. 2026

The record is rock-solid for a long-shot bet, like home run bets. — Josh Shepardson, Forbes.com, 29 July 2026

Given Arsenal’s recent success has been built on rock-solid defensive foundations, the obvious question over Vinicius Jr’s potential signing would be his willingness to work back when his side are out of possession. — Mark Carey, New York Times, 27 July 2026

Cubarsi and Laporte's rock-solid defense has leaked just one goal so far, while Merino has come off the bench twice in the last two games to score late winners and see Spain through. — Jibin Joseph, PC Magazine, 14 July 2026

Word History

First Known Use

1871, in the meaning defined above

Rhymes for rock-solid

• semisolid
• solid
• squalid
• stolid