The Collaborative International Dictionary of English v.0.48:
Inefficaciously \In*ef`fi*ca"cious*ly\, adv. Without efficacy or effect. [1913 Webster]WordNet (r) 3.0 (2006):
inefficaciously adv 1: in an ineffective manner; "he dealt with the problem rather ineffectively" [syn: inefficaciously, ineffectively] [ant: effectively, efficaciously]