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