WordWeb Online

1. (of a liquid) agitated vigorously; in a state of turbulence
   "the river's roiling current";
   - churning, roiled, roily [N. Amer], turbulent

1. Be agitated
   "the sea was roiling in the storm";
   - churn, boil, moil [N. Amer]
    
2. Make turbid by stirring up the sediments of
   - rile [N. Amer]
    
3. [N. Amer] Cause annoyance in; disturb, especially by minor irritations
   - annoy, rag, get to, bother, get at [informal], irritate, rile, nark [Brit, slang], nettle, gravel [US], vex, chafe, devil, tick off [informal]

See also: agitated

Type of: agitate, commove, displease, disturb, move, raise up, shake up, stir up, vex