Learn how to say Bumpiness correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word bumpy:
adjective (bumpier, bumpiest)
(of a surface) uneven, with many patches raised above the rest:
the car jolted on the bumpy road
(of a journey or other movement) involving sudden jolts and jerks:
the bumpy flight brought on a bout of airsickness
investors could be in for a bumpy ride