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