The Collaborative International Dictionary
Inefficaciously
Inefficaciously \In*ef`fi*ca"cious*ly\, adv. Without efficacy or effect.
Wiktionary
inefficaciously
adv. Without efficacy or effect.
WordNet
inefficaciously
adv. in an ineffective manner; "he dealt with the problem rather ineffectively" [syn: ineffectively] [ant: efficaciously, efficaciously]