Source : Webster's Revised Unabridged Dictionary (1913)

Lumpy \Lump"y\, a. [Compar. {Lumpier}; superl. {Lumpiest}.]
   Full of lumps, or small compact masses.

Source : WordNet®

lumpy
     adj 1: like or containing small stick lumps; "the dumplings were
            chunky pieces of uncooked dough" [syn: {chunky}]
     2: having lumps; not smooth and even in texture; "lumpy gravy"
     [also: {lumpiest}, {lumpier}]

lumpier
     See {lumpy}