Bumpy

wiktionary

ref

bump +‎  -y

etymonline

ref

bumpy (adj.)

of a road, etc., "marked by bumps," 1865, from bump + -y (2). Of airplane flights, "uneven because of bumps," 1911.

Fasten your seatbelts. It's going to be a bumpy night. [Bette Davis ("Margo Channing"), "All About Eve," 1950]

Related: Bumpiness.