When I saw the other driver weaving erratically across the road, I decided to keep my distance.
This fear can drive her to behave erratically at times.
She was panting heavily and her heart beat erratically.
Straight fletching may cause your arrow to fly erratically, causing you to miss your target.
The actor then began acting "erratically" and was warned by airport police to tone down his behavior.
Apparently, while attending a Sundance Film Festival event, Dunst was acting "erratically."