verb (used with object)
to render (water, wine, etc.) turbid by stirring up sediment.
to disturb or disquiet; irritate; vex: to be roiled by a delay.
verb (used without object)
to move or proceed turbulently.

1580–90; origin uncertain

unroiled, adjective

roil, royal.

2. annoy, fret, ruffle, exasperate, provoke, rile. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
roil (rɔɪl)
1.  (tr) to make (a liquid) cloudy or turbid by stirring up dregs or sediment
2.  (intr) (esp of a liquid) to be agitated or disturbed
3.  dialect (intr) to be noisy or boisterous
4.  (tr) another word (now rare) for rile
[C16: of unknown origin; compare rile]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1590, probably from M.Fr. rouiller "to rust, make muddy," from O.Fr. rouil "mud, rust," from V.L. *robicula, from L. robigo "rust" (see robust). M.E. roil meant "to roam or rove about."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
These hydrophones, as they're called, can pick up the sound of the roiling and
  churning waves caused by a hurricane.
Even if that war subsides, the worsening economy will likely inflame a roiling
  secessionist movement in the south.
As with all great challenges that have confronted mankind, the roiling climate
  will churn out winners and losers.
At this distance no one can be sure what sort of animals are roiling the sea.
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