indestructible unbreakable infrangible unyielding unruinable nonbreaking unwreckable non-breakable resistant imperishable firm toughened stout ineradicable shatterproof reinforced nonperishable sturdy indissoluble undestructable irradicable accepted accustomed chronic deep-rooted deep-seated dyed-in-the-wool entrenched firmly established fixed habituated hardened hard-shell ingrained inured inveterate long-established proved incorruptible honest unbribable honourable(UK) straight trustworthy upright principled anti-corruption conscientious correct high-principled just moral proper scrupulous ethical good high-minded righteous More