hard to catch up hard to categorize hard to change hard to check hard to chew hard to choose hard to classify hard to clean hard to climb hard to close hard to collect hard to come hard to come back hard to come back from hard to come up hard to come up with hard to communicate hard to compare hard to compete hard to complain hard to complete hard to comprehend hard to conceive hard to concentrate hard to concentrate when hard to connect hard to contain hard to continue hard to control hard to convince hard to cook hard to cope hard to count hard to cover hard to crack hard to create hard to cure hard to cut hard to dance hard to date hard to deal hard to decide hard to decide what hard to decipher hard to defeat hard to defend hard to define hard to deliver hard to deny hard to describe hard to describe what hard to design hard to destroy hard to detect hard to determine hard to develop hard to diagnose hard to die hard to differentiate hard to digest hard to disagree hard to discern hard to distinguish hard to do hard to do anything hard to do business hard to do so hard to do the right hard to do when hard to draw hard to drink hard to drive hard to earn hard to earn money hard to eat hard to end hard to endure hard to enforce hard to enjoy hard to enter hard to escape hard to establish hard to estimate hard to evaluate hard to explain hard to explain how hard to explain what hard to explain why hard to express hard to face hard to fake hard to fall hard to fall asleep hard to fathom hard to fault hard to feed hard to feel hard to fight hard to figure