godan verb (-ku), intransitive verb
be noisy; be abuzz; be unsettled
Describes a place or a group of people being noisy, restless, or in a state of low-key commotion. Also used for a person's unsettled or fluttering feeling.
教室がざわついていた。
The classroom was abuzz.
彼
His remark caused a stir in the hall.
胸がざわついて落ち着かない。
My heart is unsettled and I can't calm down.