not effective; not producing results; ineffectual: ineffective efforts; ineffective remedies.

Is it ineffective or ineffective?

It means too weak to produce the desired effect. Ineffectual is similar to ineffective, but while ineffective implies that something simply doesn't work, ineffectual carries with it the idea of weakness too.

What does effective or ineffective mean?

The difference between effective and ineffective is that effective means something that works or brings winning results whereas ineffective is used to indicate something that does not work or brings no fruitful results.