...As I scanned the acres ofrough moor and then looked at the sea lapping delicately on the grey sand I hadthe feeling that a knotty problem was before me... 
John Buchan 「Mr. Standfast」
...“Berry bad, berry bad,” he answered, shaking his head, which he always did when he found a knotty point difficult to unravel...
W.H.G. Kingston 「The Two Supercargoes」
...Without harming the jointedor knotted covers, the contents, of equal volume and equally knotty,have slipped out as easily as though they were smooth, slippery objectssliding out of a loose sheath...
J. H. Fabre Bernard Miall 「Social Life in the Insect World」
...'In order to settle this knotty point, just hand the felon up here amoment,' said the Judge...
Norman Lindsay 「The Magic Pudding」
...Here, however, this variety presented the same knotty head,where other grasses grew luxuriantly...
Thomas Mitchell 「Journal of an Expedition into the Interior of Tropical Australia」
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