solidest
Least likely yielding
Solidest is the superlative form of solid, describing something as the most firm, stable, or reliable among those compared.
While "most solid" is more common in formal writing, solidest appears in casual speech: That's the solidest argument I've heard all day.
He's the solidest player on the team.
Firm or demanding
dense · compact · tough · resilient · reinforced · concrete · rock-like · impenetrable
Worthy of confidence
- dependableWorthy of trust
- faithfulConsistently loyal and true
- loyalFirm in allegiance
- consistentNot varying or contradicting
tried-and-true · credible · authentic · genuine · secure · stable · honest · sincere
Firmly loyal, unshakeable
- unwaveringSteady and unchanging
- determinedFirmly committed to purpose
- committedFirmly pledged or bound
- staunchFirmly loyal, unyielding
unshakeable · tenacious · persistent · unyielding · adamant · inflexible · immovable · uncompromising
hard
Firm or demanding
rigid · dense · compact · tough · resilient · reinforced · concrete · rock-like · impenetrable · heavy-duty
trustworthy
Worthy of confidence
- dependableWorthy of trust
- faithfulConsistently loyal and true
- loyalFirm in allegiance
consistent · tried-and-true · credible · authentic · genuine · secure · stable · honest · sincere · sound
steadfast
Firmly loyal, unshakeable
- unwaveringSteady and unchanging
- determinedFirmly committed to purpose
- committedFirmly pledged or bound
staunch · unshakeable · tenacious · persistent · unyielding · adamant · inflexible · immovable · uncompromising · unbending