Two options are overturn and repeal.
it is sensation
stops and quits, but its more 4 letter word than 5, i just added plural and also abort
cancel
bail out
feckless
It is ineffectual (not inaffectual), and it means ineffective.
Forceless or Failing
cancel
If you mean "ineffective", that means it's not effective.
revoke! :)
The homonym for the word "inactive" is "inactivate", which means to render something inactive or to make it ineffective.
Repeal
Exit Stop Close Discontinue
"Kamjat" in Punjabi means "useless" or "ineffective."
The word "cancel" is the opposite of sit, in the sense of convene.
Given the circumstances, we had to cancel our plans and make alternate arrangements.