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able-bodied adamant adamantine agencies agency 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 decided decisive determinate determined dictatorial die-hard die-hard/diehard dogged durable earnest employer enterprise enterprises entrenched erect establishment factories factory faithful fast fast faster faster fastest fastest fixed fixed flinty gutsy hard hard hard-bitten hard-boiled 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 solidifies solidify solvent sound stabilize stable stark staunch staunchest steadfast steady stiff stiffen stock-still stony strict stricter strictest strong strong strong stubborn sturdy substantial supported sure sure surest surest taut tenacious tenacious tense thick thick tight tight tighter tighter tightest tightest tough tough tougher tougher toughest toughest traditionalist traditionalistic true true-blue unalterable unassailable unbendable unbending unbreakable unchangeable unchanged uncompliant uncompromising undisputable undoubting undoubting unfaltering unflinching unflinching unhesitating unmovable unmoved unqualified unquestioning unshakable unshaken unswayed unswerving untiring unuttered unwavering unyielding