bumpy (adj.)youdaoicibaDictYouDict[bumpy 词源字典]
1865, from bump + -y (2).
Fasten your seatbelts. It's going to be a bumpy night. [Bette Davis ("Margo Channing"), "All About Eve," 1950]
Related: Bumpiness.[bumpy etymology, bumpy origin, 英语词源]