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able-bodied adamantine adamant agencies agency al dente allegiant all-or-nothing assertive bent bound brave bravest businesses business carved in stone certain close companies compact company concern concrete condensed conservative constant crisp decided decisive determined determinate dictatorial die-hard/diehard die-hard dogged durable earnest employer enterprises enterprise entrenched erect establishment factory factories faithful fast fast faster faster fastest fastest fixed fixed flinty gutsy hard-boiled hard hard hard-bitten harden harder harder hardy healthiest healthy hell-bent houses house immovable impenetrable implicit impregnable inalterable inarguable incompliant incontestable indissoluble indurate inferred inflexible intent iron ironclad liege loyal manful more concrete more constant more compact more durable more loyal more rigid more solid more solid more undisputable more positive most certain most loyal motionless most undisputable mounted mulish neck and neck obdurate obstinate old outfit partnerships partnership peremptory persistent pertinacious positive puissant purposeful realest real refractory resolute responsible reliable rigid rocky rooted sealed secure secure set severe sinewy single-minded solidify solid solid solidifies solvent sound stabilize stable stark staunchest staunch steadfast steady stiff stiffen stock-still stony strict strictest stricter strong strong strong stubborn sturdy substantial supported sure sure surest surest taut tenacious tenacious tense thick thick tighter tighter tightest tightest tight tight tough tough toughest toughest tougher tougher traditionalist traditionalistic true true-blue unalterable unassailable unbending unbendable unbreakable unchanged unchangeable uncompliant uncompromising undisputable undoubting undoubting unfaltering unflinching unflinching unhesitating unmovable unmoved unquestioning unqualified unswayed untiring unshakable unshaken unswerving unwavering unuttered unyielding