The Collaborative International Dictionary of English v.0.48:
Erratical \Er*rat"ic*al\, a. Erratic. -- Er*rat"ic*al*ly, adv. -- Er*rat"ic*al*ness, n. [1913 Webster]WordNet (r) 3.0 (2006):
erratically adv 1: in an erratic unpredictable manner; "economic changes are proceeding erratically" [syn: erratically, unpredictably]