adjective, lump·i·er, lump·i·est.
Examples from the Web for lumpy
Objects more massive than a certain amount are more spherical than not, while punier specimens are lumpy and irregular.
But of course, states are lumpy, with pockets of wealth and poverty.Why the Republican Party’s Narrative on Income and Voting Failed|Alex Klein|December 10, 2012|DAILY BEAST
Surely he must have been "Lumpy" before, besides after, that achievement.Highways and Byways in Surrey|Eric Parker
I recall it as being more like this, not as lumpy as the other had been.Warren Commission (3 of 26): Hearings Vol. III (of 15)|The President's Commission on the Assassination of President Kennedy
"Lumpy's got on the grouch that won't come off," grinned Big-foot.The Pony Rider Boys in Texas|Frank Gee Patchin
About the most unappetizing thing I can think of is lumpy mashed potato, or mashed potato that is heavy and unseasoned.A Thousand Ways to Please a Husband|Louise Bennett Weaver
These lumpy protoplasmic bodies, usually elongated while creeping, if mechanically jarred, contract into a spherical form.Response in the Living and Non-Living|Jagadis Chunder Bose