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