◎◎◎ trouble ⪢⪢
_____ is a problem or a difficulty.
http://qindex.info/i.php?x=14093

◎◎◎ challenge ⪢⪢
A challenge is something difficult to complete
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◎◎◎ insomnia ⪢⪢
Insomnia is a condition in which a person has difficulty sleeping.
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◎◎◎ hardy ⪢⪢
capable of enduring difficult conditions
http://qindex.info/i.php?x=26

○○○ wrap ⪢⪢
This is one of the fundamental questions of quantum physics and even Einstein had difficulty wrapping his brain around it.
http://qindex.info/i.php?x=5927

○○○ tenacious ⪢⪢
I'm sure that he'll finish that difficult sale. He is very tenacious.
http://qindex.info/i.php?x=18699

○○○ rugged ⪢⪢
The country's rugged geography makes administration from a central government difficult.
http://qindex.info/i.php?x=19288

○○○ courtesy of ⪢⪢
They have multiple layers of protection courtesy of their thick blubber which protect all their major veins and arteries making them extremely difficult to dispatch.
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○○○ Albert Einstein ⪢⪢
In the middle of difficulty, lies opportunity. #quote
http://qindex.info/i.php?x=20301

○○○ get over ⪢⪢
When we _____ something, we're usually recovering from something or continuing on after a difficult situation.
http://qindex.info/i.php?x=11934

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