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
Walter ClemonsHe is right to imply that the political structure is a little shaky—it was a myth that it was ever rock solid.—Xan Smiley
Xan SmileyExamples of rock-solid in a Sentence
Recent Examples on the Web
America’s treaty alliances with South Korea and Japan are rock-solid in large part because of these institutional (political and military) linkages.
—Bilal Y. Saab, Time, 22 Nov. 2025
Its Auxetic liner wraps the foot evenly for instant comfort, while Lange’s cuff-to-shell design delivers smooth, precise energy transfer and rock-solid edge control.
—Jenny Wiegand, Outside, 14 Nov. 2025
The outperformance is a return to form for Apple, whose cash-generating prowess and rock-solid balance sheet have in past bouts of turbulence left it relatively unscathed.
—Bloomberg, Mercury News, 7 Nov. 2025
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
See All Example Sentences for rock-solid
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Bilal Y. Saab, Time, 22 Nov. 2025
Its Auxetic liner wraps the foot evenly for instant comfort, while Lange’s cuff-to-shell design delivers smooth, precise energy transfer and rock-solid edge control.
—Jenny Wiegand, Outside, 14 Nov. 2025
The outperformance is a return to form for Apple, whose cash-generating prowess and rock-solid balance sheet have in past bouts of turbulence left it relatively unscathed.
—Bloomberg, Mercury News, 7 Nov. 2025
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
See All Example Sentences for rock-solid
Cite this Entry
“Rock-solid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rock-solid. Accessed 4 Dec. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share