Sporadically means 'now and again', 'here and there', 'not very regularly'
sporadically
sporadically
consistently
I don't know if it's necessarily harmful, but it's ineffective if you're trying to prevent pregnancy. You might as well be not taking the pills at all if it's that sporadically.
possibly "sporadically".
True
The opposite of weekly is irregularly or sporadically.
The turbio won't engage, or will only engage sporadically.
It is either the speed sensor or the wiring. Have it checked out.
occurring at irregular intervals or only in a few places; scattered or isolated
Check for a loose ground cable
Probably bad brushes in the motor.