Pronunciation: (bum'pē),[key] —adj.,bump•i•er, bump•i•est. 1. of uneven surface; full of bumps: a bumpy road. 2. full of jolts: a bumpy ride. 3. causing jolts: Bumpy air shook the airplane. 4. having many difficulties or failures; full of ups and downs: He had a rather bumpy career before he settled down in his present job.