inefficacious

[adj] - lacking the power to produce a desired effect
Found on http://www.webdictionary.co.uk/definition.php?query=inefficacious

Inefficacious

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

inefficacious

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

Inefficacious

• (a.) Not efficacious; not having power to produce the effect desired; inadequate; incompetent; inefficient; impotent.
Found on http://thinkexist.com/dictionary/meaning/inefficacious/
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