Where does “bumpy” come from?

Bumpy derives from Middle English -y, Middle French -ie, Latin -ia, Latin -ivus, Latin -ia, Proto-Indo-European -kos, and Proto-Indo-European -kos, forming an adjective from a nominal base through successive suffixation.

bumpy (English): rough; jumpy; causing or characterized by jolts...

Definitions

rough; jumpy; causing or characterized by jolts...

Ancestry of “bumpy”, step by step

Step	Language	Word	Meaning
1	English	-y	Added to nouns and adjectives to form adjectives...
2	Middle English	-y	Designates an adjective, in many cases formed by...
3	Old English	-iġ	-y, -ic
4	Proto-West Germanic	-g	Forms adjectives from nouns and verbs with a...
5	Proto-Germanic	-gaz	-y
6	Proto-Indo-European	-ḱos	-y, -ic

Words derived from “bumpy”

bumpiness
bumpily

Every word from Proto-Indo-European -ḱos →Every word from English -y →Every word from Old English -iġ →