Từ đồng nghĩa của as hard as iron

hard solid firm rigid strong tough durable hardened robust steely stiff sturdy unbreakable unmalleable unpliable impenetrable impermeable indurate indurated inflexible rocklike rocky set solidified stiffened stony adamantine concentrated renitent rock-hard rock-like rock-solid unyielding as hard as stone concrete frozen really hard very hard as hard as a rock compact impliable inelastic dense thick unbending congealed non-flexible impervious compressed taut compacted close unbendable immalleable unflexible tight condensed jelled substantial close-grained refractory heavy nonporous rugged fixed sealed massed resistant brittle tense unsupple tightly packed stiff as a board fine-grained unmoving granite iron incompressible nonflexible obdurate adamant starched flinty gelled walkable chiseled chiselled jellified stout husky ungiving blocked immutable coagulated unrelenting resolute incompliant inextensible inductile unadaptable stable unchangeable consolidated dimensional rigorous annealed numbed unwavering nonstretchable uncompromising jellied viscid brick wall like a rock set in stone thickset packed non-stretchable piled jammed crowded jelly-like inviolable unpierceable impregnable impassable serried puncture-proof indestructible jammed together packed in close-packed jam-packed closely set closely packed waterproof unattackable closed impassible invulnerable unassailable hermetic secure safe unpiercable hermetically sealed murky bulletproof fortress-like

as hard as nails as hard as one can as hard as possible as hard as stone Asha Vahishta ash blonde as hard as a rock as happy as Larry as happy as a sandboy as happy as a clam ashames ashamed to