inefficacious

Adjective

Meaning

Not efficacious; not having power to produce the effect desired; inadequate; incompetent; inefficient; impotent.

Source: Webster's dictionary

ineffective sisyphean unable weak empty unsuccessful inadequate null useless inefficient impractical incapable vain idle sterile

Show all synonyms

efficacious economic successful active effective useful

Show all antonyms

laws that are inefficacious in stopping crime Source: Internet