iron will

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See: tenacity
References in periodicals archive ?
for he's up against men with iron wills and nerves of steel--and bodies hard as nails.
Log on to any one of the proliferation of pro-anorexia websites and you enter a terrifying world of iron wills and cavernous stomachs, where anorexics and bulimics share tips on successful starvation and where the inspirational mantras include gems such as: "It's better to be thin and dead than fat and living."
It isn't only the raven-black hair, determined little chin and chic clothes, but a breathless charm coupled with a very adult reserve - iron wills corseted in velvet softness.