ineffectiveness
🇺🇸
/ˌɪnɪˈfektɪvnəs/
🇬🇧
/ˌɪnɪˈfektɪvnəs/
When something doesn't work well or achieve the desired outcome.
The doctor was concerned about the ineffectiveness of the treatment.
醫生對這種治療的無效性感到擔憂。