This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Not producing an intended effect; ineffectual: an ineffective plea.

adj. Inadequate; incompetent: an ineffective teacher.

adj. not having the desired effect; ineffectual

adj. lacking in ability; incompetent or inadequate

adj. Not effective; not having the desired effect; ineffectual; futile; inefficient; useless.

Not effective; not producing any effect, or the effect desired; wanting effective energy or operation; inefficient; impotent: as, ineffective efforts; an ineffective blow.

adj. not producing an intended effect

adj. lacking in power or forcefulness

adj. lacking the ability or skill to perform effectively; inadequate

"In 2008, Navarro joined with other former FBI and CIA interrogators to denounce the use of waterboarding and other so-called “enhanced interrogation techniques,” which they called ineffective, counterproductive and unethical."

unproductive    toothless    impotent    incompetent   

ineffectual    futile    inefficient    useless   

affective    anti-infective    collective    connective    convective    corrective    defective    detective    directive    effective   

ineffectual    futile    inefficient    unsatisfactory    pointless    inadequate    unable    unproductive    impractical    uninteresting