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