1. (a.) Made of steel; consisting of steel.

2. (a.) Resembling steel; hard; firm; having the color of steel.

Philistine Quaker-colored acier adamant adamantine ashen ashy aureate beefy bony bouncing brass brassy brazen bronze bronzy callous calloused canescent case-hardened cast-iron cement cemental cinereous cinerous concrete constant copper coppery corneous cupreous cuprous dapple dapple-gray dappled dappled-gray dense diamondlike dingy dismal doughty dour dove-colored dove-gray dreary dull dure dusty ferrous ferruginous firm fixed flintlike flinty forceful forcible forcy full-blooded full-strength gilt glaucescent glaucous gold gold-filled gold-plated golden granitelike granitic gray gray-black gray-brown gray-colored gray-drab gray-green gray-spotted gray-toned gray-white grayed grayish grey grim griseous grizzle grizzled grizzly gutsy gutty hale hard hard as nails hard-core hardened hardhearted hardy hearty hefty horny husky immovable immutable impervious implacable impliable indurate indurated inelastic inexorable inflexible insensitive intransigent inured iron iron-gray iron-hard ironlike irreconcilable lapideous lead lead-gray leaden lithoid lithoidal livid loyal lusty marble marblelike mercurial mercurous mighty mouse-colored mouse-gray mousy nervy nickel nickelic nickeline obdurate obstinate osseous pachydermatous pearl pearl-gray pearly pewter pewtery potent powerful proof against puissant quicksilver red-blooded relentless resistant resistive rigid rigorous robust robustious rock-ribbed rocklike rocky rugged sad set settled silver silver-gray silver-plated silvered silvery slate-colored slaty smoke-gray smoky sober solid somber sot stalwart staunch steadfast steady steel steel-gray steeled against steellike stern stiff stone-colored stonelike stony stout strapping strong strong as brandy strong as strong strong-willed sturdy taupe thick-skinned tin tinny tough TRUE unaffected unalterable unbending unchangeable uncompromising undeflectable unflappable ungiving unmoved unrelenting unshaken unswerving unyielding vigorous