adjective
COLLOCATIONS FROM OTHER ENTRIES
a thorny/knotty problem (= difficult )
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He still faced the thorny problem of finding a way out of the jungle.
COLLOCATIONS FROM CORPUS
■ NOUN
problem
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I have had many letters from knitters asking for help with knotty problems .
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Flying is at the heart of this knotty problem .
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And in fact patient research has gone a long way towards resolving this knotty problem .
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Night after night, all over the country, ordinary married couples must be wrestling with exactly this sort of knotty problem .