1. the quality or state of being effectual; the ability to produce a desired or intended result

Examples

• The effectualness of the new marketing campaign was evident in the increased sales.
• We questioned the effectualness of the proposed solution before implementing it.
• The doctor praised the effectualness of the treatment in reducing the patient's symptoms.
• The team's effectualness improved after they reorganized their workflow.
• Critics doubted the effectualness of the policy in addressing the underlying problem.