haphazardly

disruptive

adj. causing confusion and interruption
causing problems and preventing something from continuing in its usual way
v. disrupt
Syn. disturbing
n. disruption
adv. disruptively

Frequent questions during lectures can be disruptive.
The storm caused a disruption in bus service.
He has a disruptive influence on the other children.
disruptive to
Night work can be very disruptive to home life.
Mike's parents thought I was a disruptive influence (=a person who causes disruption) .
ways to handle disruptive pupils.
because of disruptive remarks, he was asked to leave the meeting.