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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 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 harden harder harder hardy healthiest healthy hell-bent house houses immovable impenetrable implicit impregnable inalterable inarguable incompliant incontestable indissoluble indurate inferred inflexible intent iron ironclad liege loyal manful more compact more concrete more constant more durable 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 partnerships partnership peremptory persistent pertinacious positive puissant purposeful real realest refractory reliable resolute responsible rigid rocky rooted sealed secure secure set severe sinewy single-minded solid solid solidifies solidify solvent sound stabilize stable stark staunch staunchest 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 tight tight tighter tighter tightest tightest tough tough toughest toughest tougher tougher traditionalist traditionalistic true-blue true 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