efficacious vs inefficacious

efficacious and inefficacious both are adjectives.

Word	Noun	Adjective	Verb	Adverb
efficacious	No	Yes	No	No
inefficacious	No	Yes	No	No

efficacious (adjective)	inefficacious (adjective)
marked by qualities giving the power to produce an intended effect	lacking the power to produce a desired effect
producing or capable of producing an intended result or having a striking effect