Correspondents say this is the International Atomic Energy Agency's toughest report on Iran to date.
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There are great returns to be made in retail, but it is the toughest asset class.
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The toughest nut to crack here is the role of government in providing health care.
Those exchanges are some of the toughest, most candid, spirited discussions that I have.
But he warned the next settlement from 2011 was likely to be the "toughest for decades".
Even in the toughest of neighbourhoods the strongest of words can make a difference.
Lukas, a five-time Preakness winner, thinks the next race will be the toughest for Orb.
"We always anticipated that the first half of 2013 would be our toughest comparison, " he added.
Now comes the last, and for some taxpayers toughest part: proving you really did the hours.
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The team has adopted the toughest of anti-doping regimes, including fortnightly tests for all its riders.
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Now it's considered the toughest program of all the major sport leagues in the country.
The toughest question left is Greece's remaining debt, which will increasingly be held by euro-zone governments.
Deputy Prime Minister Nick Clegg has had one of his toughest weeks in government.
The toughest item was an enormous doghouse that didn't fit in the wrapping machine.
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And one of the toughest parts of the sales process is building a prospect list.
One of the toughest problems, he says, is finding the right staff for his companies.
Why the gold rush into Medicaid, the poorest, toughest segment of our health care system?
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The toughest part of taking in feedback is staying somewhere in the gray area.
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The second day of that ride is considered the toughest day of riding in Ragbrai history.
The English language is one of the toughest and most beautiful objects ever invented.
Either way Mr Blair's successor will have one of the toughest jobs in Washington.
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Amid such tensions, miracles unfold on a basketball court in Baglar, Diyarbakir's toughest neighbourhood.
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He says that he needed to find the toughest critics possible in order to have credibility.
His toughest task: convincing the white business elite that Civic Ventures isn't a charitable fund.
Jack Lew has decades of experience tackling some of the nation's toughest economic challenges.
Then there's the toughest part of drugmaking: Inventing new medicines and getting them past regulators.
The ride is described as one of the "toughest and highest" in the world.
There's only one president at a time, occupying the toughest job in the world.
This team played one of the toughest schedules in all of college football last year.
Challenges of physically connecting Dragon with the space station are the toughest elements of the mission.
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