the GNU version of the Collaborative International Dictionary of English
adj. Composed of clumps; massive; shapeless.
The Century Dictionary and Cyclopedia
Consisting of clumps; massive; lumpy.
Word Usage
"In Boston's Route 128 beltway, by contrast, networks are more "clumpy" -- people tend to work with the same people, who in turn tend to be isolated from their counterparts at other companies."