just curious but which one is good and which one is bad Effective or Ineffective?

Effective: adequate to accomplish a purpose; producing the intended or expected result

Ineffective: not effective; not producing results

'in':a prefix of Latin origin, corresponding to English un-, having a negative or privative force.

The prefixes in- and un- may both have, among other uses, a negative force. In- is the form derived from Latin, and is therefore used in learned words or in words derived from Latin or (rarely) Greek: inaccessible, inaccuracy, inadequate, etc. Un- is the native form going back to Old English, used in words of native origin, and sometimes used in combination with words of other origins if these words are in common use: unloving, ungodly, unfeeling, unnecessary, unsafe.

Reference: dictionary.com