erratic

the erratic behaviour of the old car.

the wicket was causing the occasional erratic bounce.

he was let down by an erratic serve.

He is a very erratic football player.

an erratic deflection from an intended course

People say that Erratics may be rewarmed steeping in songs by Dido.

This is especially problematic when the team thinks you're an erratic, egomaniacal nutcase with little or no real world chops.

Erratics ate boulders transported by glaciers and deposited some distance from their point of origin.

I would miss my loving, erratic, harebrained mother. And her new husband.