Jagged, bumpy (6)
I believe the answer is:
uneven
This clue is a double definition.
'jagged' is the first definition.
(similar in meaning)
'bumpy' is the second definition.
(I've seen this before)
(Other definitions for uneven that I've seen before include "Irregular or not smooth" , "Rough, jagged" , "Rough on the surface" , "Ill-matched - irregular" , "Not level or smooth" .)