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able-bodied adamantine adamant agency agencies 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 determinate determined 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 house houses immovable impenetrable implicit impregnable inalterable inarguable incompliant incontestable indissoluble indurate inferred inflexible intent ironclad iron 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 solid solid solidify solidifies solvent sound stabilize stable stark staunchest staunch steadfast steady stiffen stiff stock-still stony strict strictest stricter strong strong strong stubborn sturdy substantial supported sure sure surest surest taut tenacious tenacious tense thick thick tightest tightest tighter tighter tight tight tough tough toughest toughest tougher tougher traditionalistic traditionalist true-blue true unalterable unassailable unbending unbendable unbreakable unchangeable unchanged uncompliant uncompromising undisputable undoubting undoubting unfaltering unflinching unflinching unhesitating unmovable unmoved unquestioning unqualified unswayed untiring unshakable unshaken unswerving unuttered unwavering unyielding