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able-bodied adamant adamantine agency agencies al dente all-or-nothing allegiant assertive bent bound bravest brave business businesses carved in stone certain close compact companies company concern condensed concrete conservative constant crisp decisive decided determinate determined dictatorial die-hard die-hard/diehard dogged durable earnest employer enterprise enterprises entrenched erect establishment factories factory faithful fast fast fastest fastest faster faster fixed fixed flinty gutsy harden hard-boiled hard hard hard-bitten 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 constant more concrete more compact 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 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 solvent solidify solid solid sound stabilize stable stark staunchest staunch steadfast steady stiff stiffen stock-still stony strictest stricter strict strong strong strong stubborn sturdy substantial supported sure sure surest surest taut tenacious tenacious tense thick thick tighter tighter tight tight tightest tightest tougher tougher tough tough toughest toughest traditionalistic traditionalist true true-blue unalterable unassailable unbending unbendable unchangeable unchanged unbreakable uncompliant uncompromising undisputable unfaltering unflinching unflinching unhesitating unqualified unswerving undoubting undoubting unshaken unswayed unquestioning unshakable unmovable unmoved unwavering unyielding unuttered untiring