Rock-solid
adj.capable, calmplayful
What it means
Extremely firm, dependable, or well supported.
Reach for it when giving emphatic confidence where evidence justifies it
The bridge rests on rock-solid foundations above the flood line.
Choose between these
6- playful
airtight
an argument leaves no apparent gap
not when Airtight is unsuitable for people.
- warm
consistent trustworthiness is central
not when Dependable is less emphatic.
- professional
performance survives demanding conditions
not when Robust does not imply certainty.
- professional
resistance to unwanted change is measured
not when Stable may still be mediocre.
- formal
sound
reasoning or construction is well founded
not when Sound is quieter praise.
- literary
unshakeable
confidence or resolve cannot be disturbed
not when Unshakeable is absolute.
Said against
3- shaky
- fragile
- unreliable
It naturally appears in
3- rock-solid evidence
The claim needs rock-solid evidence before publication.
- rock-solid foundation
Trust provided a rock-solid foundation for the partnership.
- remain rock-solid
The repaired steps remained rock-solid all winter.
Where this comes from
- wiktionary, English adjective sense: completely firm or reliable opens in a new tab · retrieved 2026-07-26
The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.