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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 condensed concrete conservative constant crisp decisive decided determinate determined die-hard/diehard dictatorial die-hard dogged durable earnest employer enterprises enterprise entrenched erect establishment factories factory 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 positive more undisputable most certain most loyal most undisputable mounted motionless mulish neck and neck obdurate obstinate old outfit partnership partnerships peremptory persistent pertinacious positive puissant purposeful realest real refractory resolute responsible reliable rigid rocky rooted sealed secure secure set severe sinewy single-minded solvent solidify solid solid solidifies sound stabilize stable stark staunchest staunch steadfast steady stiff stiffen stony stock-still strict strictest stricter strong strong strong sturdy stubborn substantial supported surest surest sure sure taut tenacious tenacious tense thick thick tightest tightest tight tight tighter tighter tough tough toughest toughest tougher tougher traditionalist traditionalistic true-blue true unassailable unalterable unbending unbendable unbreakable unchangeable unchanged uncompliant uncompromising undisputable undoubting undoubting unfaltering unflinching unflinching unhesitating unmoved unmovable unquestioning unqualified untiring unswayed unswerving unshaken unshakable unwavering unuttered unyielding