Longman Dictionary of Contemporary English homepage

ineffective

 adjective
     
in‧ef‧fec‧tive
something that is ineffective does not achieve what it is intended to achieve [≠ effective]
ineffective in doing something
The chemical was almost totally ineffective in killing the weeds.
ineffective against
Various drugs have proved ineffective against the virus.
an ineffective marketing campaign
—ineffectively adverb
—ineffectiveness noun [uncountable]
the ineffectiveness of most diets
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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