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.
ONLY those with stout hearts and iron wills need bother to attend St Andrews tonight in the jousting colours of black and white.
Their iron wills of competitiveness mirror that of Howland, and both understand the significance of playing the Gators for the championship.
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.