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able-bodied adamantine adamant agencies agency al dente allegiant all-or-nothing assertive bent bound brave bravest businesses business carved in stone certain close companies compact company concrete condensed concern conservative constant crisp decided decisive determinate determined die-hard/diehard dictatorial die-hard dogged durable earnest employer entrenched enterprises enterprise erect establishment factory factories faithful faster faster fastest fastest fast fast flinty fixed fixed gutsy hard hard harder harder hard-bitten harden hard-boiled hardy healthy healthiest hell-bent house houses impenetrable immovable impregnable inarguable implicit inalterable incontestable incompliant indissoluble indurate inferred inflexible intent ironclad iron liege loyal manful more concrete more constant more compact more durable more loyal more solid more solid more rigid 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 resolute responsible reliable rigid rocky rooted sealed secure secure set severe sinewy single-minded solvent solidifies solidify solid solid sound stable stabilize stark staunch staunchest stiffen stiff steady steadfast stony strict strictest strong strong strong stock-still stricter sturdy substantial stubborn sure sure surest surest supported taut tense tenacious tenacious thick thick tightest tightest tighter tighter tight tight tough tough toughest toughest tougher tougher traditionalistic traditionalist true-blue true unalterable unassailable unbendable unbending unbreakable unchanged unchangeable uncompliant uncompromising undisputable undoubting undoubting unfaltering unflinching unflinching unhesitating unmovable unmoved unquestioning unqualified untiring unswayed unshakable unshaken unswerving unuttered unwavering unyielding