Quick definitions from WordNet (vex)
▸ verb: subject to prolonged examination, discussion, or deliberation ("Vex the subject of the death penalty")
▸ verb: cause annoyance in; disturb, especially by minor irritations
▸ verb: be a mystery or bewildering to ("A vexing problem")
▸ verb: change the arrangement or position of
▸ verb: disturb the peace of mind of; afflict with mental agitation or distress
▸ Also see vex
▸ verb: subject to prolonged examination, discussion, or deliberation ("Vex the subject of the death penalty")
▸ verb: cause annoyance in; disturb, especially by minor irritations
▸ verb: be a mystery or bewildering to ("A vexing problem")
▸ verb: change the arrangement or position of
▸ verb: disturb the peace of mind of; afflict with mental agitation or distress
▸ Also see vex