efficacious

Meanings

• marked by qualities giving the power to produce an intended effect; -Aldous Huxley
  • "written propaganda is less efficacious than the habits and prejudices...of the readers"
  • "the medicine is efficacious in stopping a cough"
• producing or capable of producing an intended result or having a striking effect; -LewisMumford
  • "an efficacious law"

Synonyms

effective, effectual