1. in a manner that fails to produce the desired or expected result; without efficacy
Usage: formal; rare

Examples

• The medication worked inefficaciously, providing little relief to the patient.
• He argued inefficaciously, failing to convince the jury of his innocence.
• The new policy was implemented inefficaciously and did not achieve its intended goals.
• The team played inefficaciously in the first half, missing numerous scoring opportunities.
• She attempted inefficaciously to repair the broken device without proper tools.