Unwieldy or clumsy, especially due to excess weight
There were dark circles beneath her light eyes, her hair was in a half-assed lumpy ponytail, and her face was so pale and drawn, she looked ill.
She rubbed the lumpy scar on her arm, her attention caught by the sight of a jaguar dropping from a tree branch to the edge of the park and the forest a short distance away.
The apparatus used for these purposes in some localities is of a very primitive kind, and the reeling being uneven and lumpy the silk is of inferior quality and low value.
I'll probably choose a nice but plainish yarn (meaning nothing with a lumpy texture) and determine the recommended gauge for said yarn.
lumpy old mattress.