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