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

In many ways, having a talent for low-key styling is even more admirable than having a rock-solid red carpet presence. —Kelsey Stiegman, InStyle, 28 May 2026

Meanwhile, 20-year-old Jon Martin was rock-solid as Real Sociedad won the Copa del Rey. —The Athletic Uk Staff, New York Times, 22 May 2026

Like Scamp, the company leverages its reputation for building rock-solid, long-lasting campers toward offering an even tougher breed of trailer, built for adventures that carry well beyond organized campgrounds. —C.c. Weiss may 10, New Atlas, 10 May 2026

Ruth is an extraordinary heroine, rock-solid strong in a completely unshowy, sincere, vulnerable way. —Literary Hub, 7 May 2026

Word History

First Known Use

1871, in the meaning defined above

Rhymes for rock-solid

• semisolid
• solid
• squalid
• stolid