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