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