inefficacious
adjective
[ ˌɪnɛfɪˈkeɪʃəs ]
• not producing the desired effect.
• "social conventions honed over thousands of years were suddenly inefficacious"
Similar:
ineffective,
unsuccessful,
non-successful,
unproductive,
fruitless,
profitless,
unprofitable,
abortive,
failed,
futile,
purposeless,
worthless,
useless,
ineffectual,
inefficient,
inadequate,
vain,
unavailing,
to no effect,
idle,
feeble,
weak,
inept,
lame,
bootless,
unfructuous,
inutile,
