In·ef`fi·ca'cious adjective [ Prefix in- not + efficacious : confer French inefficace , Latin inefficax .] Not efficacious; not having power to produce the effect desired; inadequate; incompetent; inefficient; impotent. Boyle. « The authority of Parliament m... Found on http://www.encyclo.co.uk/webster/I/49
adjective lacking the power to produce a desired effect; `laws that are inefficacious in stopping crime` Found on https://www.encyclo.co.uk/local/20974