Filled or covered with lumps. (Merriam – Webster)
Characterised by choppy waves. (Merriam – Webster)
Having a heavy clumsy appearance. (Merriam – Webster)
Uneven and often crude in style. (Merriam – Webster)
Something that is lumpy contains lumps or is covered with lumps. (Collins Dictionary)
Covered with or containing lumps. (Cambridge Dictionary)
Full of lumps: (Dictionary.com)
Covered with lumps, as a surface. (Dictionary.com)
Heavy or clumsy, as in movement or style; crude: (Dictionary.com)
Lumpy species coexistence arises robustly in fluctuating resource environments.
Lumpy skin disease.