no effect
- ineffectiveLacking power to achieve
- futileIncapable of producing results
- uselessWithout practical value
- pointlessLacking any purpose
- fruitlessProducing no useful outcome
vain · null · void · unchanged · zilch · nothing · zero · flat · inert · neutral · placebo · empty · hollow · wasted · impotent · powerless · stagnant · unmoved
causal efficacy
no effecteffective
Producing intended results
efficacious · potent · impactful · consequential · influential