Synonyms for Inefficacious

Synonyms starting with letter F

• futile

  ineffectual, ineffective
• fruitless

  ineffectual
• feckless

  ineffectual
• feeble

  ineffectual
• forceless

  ineffectual
• failed
• frivolous
• faulty
• forlorn
• for nothing
• frustrated
• foiled
• frustrating
• for naught