hard as nails
Unyielding, callous, unsympathetic, as in Don't ask her for a contribution—she's hard as nails. This expression has replaced the 14th-century simile hard as flint stone and presumably alludes to the rigidity of nails.
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How to use hard as nails in a sentence
Just the hard-on before you shoot unarmed members of the public.'Babylon' Review: The Dumb Lives of Trigger-Happy Cops|Melissa Leon|January 9, 2015|DAILY BEAST
But so-called jungle primaries are notoriously hard to predict or poll.The Golden State Preps for the ‘Red Wedding’ of Senate Races|David Freedlander|January 9, 2015|DAILY BEAST
My body used for his hard pleasure; a stone god gripping me in his hands.‘A Gronking to Remember’ Speed Read: 8 Naughtiest Bits|Emily Shire|January 7, 2015|DAILY BEAST
All of my stories are about people trying hard not to grow up.Here’s the Lost Judd Apatow ‘Simpsons’ Episode, Penned by Judd Apatow|Asawin Suebsaeng|January 6, 2015|DAILY BEAST
We also have a growing body of biological research showing that fathers, like mothers, are hard-wired to care for children.
He thought they were now in touch with our troops at "X" but that they had been through some hard fighting to get there.Gallipoli Diary, Volume I|Ian Hamilton
However this be, it is hard to say that these fibs have that clear intention to deceive which constitutes a complete lie.Children's Ways|James Sully
And it would be hard indeed, if so remote a prince's notions of virtue and vice were to be offered as a standard for all mankind.Gulliver's Travels|Jonathan Swift
Even if poverty were gone, the flail could still beat hard enough upon the grain and chaff of humanity.The Unsolved Riddle of Social Justice|Stephen Leacock
"I congratulate you on your engagement," he said at last, looking up with a face that seemed to Bernard hard and unnatural.Confidence|Henry James