Epiphenomenal(adjective)
A secondary effect or by-product that arises from but does not influence a process. (???????? ??????, ??-????)
Synonyms: Secondary, Incidental, Consequential, Derivative
Antonyms: Primary, Fundamental, Causal, Essential
Example: Some scientists argue that consciousness is merely an epiphenomenal result of brain activity.
Trick to remember: Epiphenomenal effect wahi hota hai jo extra aata hai — main kaam ka nahi, bas side effect! 
