inefficient Antonyms

efficient capable of skilled skilful saving rentable realistic prolific profitable proficient productive pragmatic practical potent pearl operative operant skillful successful well-planned well-ordered impactful cost-efficient cost-effective multipurpose cash crop pragmatics unstinted streamlined moneymaking utilitarian useful tuned timesaving systematic nugget neat competent clever capable businesslike beneficial beautiful bankable availing applicable aerodynamic advantageous adequate adept