She resigned in 2011, saying it was too difficult to juggle work with caring for an infant and toddler.

NPR: Couple Jailed For Fleeing With Kids To Face Judge

The UN stopped estimating the death toll in Syria after it passed 5, 400 in January, saying it was too difficult to confirm.

BBC: UN Syria text drops call for Assad power handover

Mr. JEFF BENOIT (Coastal Geologist): It was too difficult to think about a lot of money being spread out over, you know, 30 years, and how do you really account for that.

NPR: Restoration of Gulf Coast Wetlands Poses Challenge

There were those who said it was going to be too difficult, or that it was bad politics, or it was throwing good money after bad.

WHITEHOUSE: Standing Behind the American Auto Industry

He said members were concerned the contract was awarded too cheaply, and it would be difficult for an organisation to double the service provided for the same cost and still meet quality standards.

BBC: England

Ken Lay, who sold shares of Enron back to the company in the months leading up to its bankruptcy filing, was not even charged with insider trading, perhaps because the nature of his transactions would have made it too difficult for the prosecution to prove the charge, lawyers said.

FORBES: A Glimmer Of Hope