0 not smooth: --
It might be a bumpy flight (= an uncomfortable and rough flight) because there's a lot of air turbulence ahead.
As usual in foreign affairs, the going was sometimes bumpy.
The islanders were totally unaware of its coming until it was landed by its very skilful pilot on the bumpy race course.
The track is three times bumpier than before.
Despite its difficulties, we would like to make the path to peace less bumpy in the future.
However, there is still a pretty bumpy road ahead.
We are in the last stretch to the finish, but the road will still be rather bumpy.
Today we complete the parliamentary procedure on a report which has had a very bumpy ride.
Squishy surfaces can be bumpy or smooth.