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