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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 company compact companies concern concrete condensed constant conservative crisp decided decisive determinate determined dictatorial die-hard die-hard/diehard dogged durable earnest employer enterprises enterprise entrenched erect establishment factories factory faithful faster faster fast fast fastest fastest fixed fixed flinty gutsy hard hard hard-boiled hard-bitten harden harder harder hardy healthy healthiest hell-bent houses house immovable impenetrable implicit impregnable inarguable inalterable incompliant incontestable indissoluble indurate inferred inflexible intent iron ironclad liege loyal manful more concrete more compact more constant more durable more loyal more positive more rigid more solid more solid 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 rooted rocky sealed secure secure set severe sinewy single-minded solidify solid solid solidifies solvent sound stabilize stable staunch staunchest stark steady steadfast stiff stiffen stock-still stony strictest stricter strict stubborn strong strong strong 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 unbendable unbending unbreakable unchangeable unchanged uncompromising uncompliant undisputable undoubting undoubting unfaltering unflinching unflinching unhesitating unquestioning unmovable unmoved unqualified unshakable unshaken unswayed untiring unswerving unuttered unwavering unyielding