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