rock solid
Firm beyond doubt
Rock solid describes something completely stable, reliable, or unshakeable—as firm as stone.
A rock solid alibi withstands scrutiny.
A rock solid marriage faces no threat of collapse.
Rock solid evidence leaves no room for doubt.
The phrase emphasizes dependability or structural integrity, whether literal or figurative: The foundation is rock solid.
Worthy of confidence
- dependableWorthy of trust
- steadfastFirmly loyal, unshakeable
- unwaveringSteady and unchanging
- faithfulConsistently loyal and true
consistent · unfailing · loyal · proven · guaranteed · assured · secure · tried-and-true
Incapable of being changed
- permanentFixed without end
- fixedRestored or immovable
- unalterableIncapable of being changed
- constantFixed, unvarying quantity
enduring · steadfast · unwavering · irreversible · eternal · stable · firm · unshakable
Solidly built, durable
- robustStrong and durable
- toughDurable and strong
- resilientAble to recover quickly
- reinforcedMade more resistant
fortified · indestructible · hardy · stout · rugged · heavy-duty · industrial-strength · bombproof
trustworthy
Worthy of confidence
- dependableWorthy of trust
- steadfastFirmly loyal, unshakeable
- unwaveringSteady and unchanging
faithful · consistent · unfailing · loyal · proven · guaranteed · assured · secure · tried-and-true · staunch
immutable
Incapable of being changed
- permanentFixed without end
- fixedRestored or immovable
- unalterableIncapable of being changed
constant · enduring · steadfast · unwavering · irreversible · eternal · stable · firm · unshakable · entrenched
sturdy
Solidly built, durable
reinforced · fortified · indestructible · hardy · stout · rugged · heavy-duty · industrial-strength · bombproof · unbreakable
- certaintycertain, sure, uncertain, unsure, definite
- strength wordsstrong, powerful, mighty, potent, robust
- reliabilityreliable, dependable, trustworthy, consistent, faithful
- Motorcycle Trickswheelie, stoppie, backflip, superman, no-hander
- intensifiersvery, really, extremely, absolutely, incredibly
- loyaltyloyalty, devotion, loyal, faithfulness, fidelity
rock solidunreliable
Not consistently performing
untrustworthy · flaky · undependable · inconsistent · erratic
rock, solid, rocky, rocks, solidify, solidity, consolidate, rock-solid, solidified