The Collaborative International Dictionary of English v.0.48:

Roily \Roil"y\, a.
   Turbid; as, roily water.
   [1913 Webster]

WordNet (r) 3.0 (2006):

roily
    adj 1: (of a liquid) agitated vigorously; in a state of
           turbulence; "the river's roiling current"; "turbulent
           rapids" [syn: churning, roiling, roiled, roily,
           turbulent]

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "roily":
   adiaphanous, amiss, askew, awry, cloudy, cockeyed, convulsed, dark,
   deranged, disarranged, discomfited, discomposed, disconcerted,
   dislocated, disordered, disorderly, disorganized, disturbed,
   grumly, haywire, impervious to light, in disorder, intransparent,
   misplaced, obscure, on the fritz, opaque, out of gear,
   out of joint, out of kelter, out of kilter, out of order,
   out of place, out of tune, out of whack, perturbed, roiled,
   shuffled, turbid, turbulent, unsettled, upset