WordNet sense 1 (having lumps; not smooth and even in texture):

lumpy

WordNet sense 2 (having a sharply uneven surface or outline):

jagged, jagged

WordNet sense 3 (of a surface; not level or flat):

irregular

WordNet sense 4 ((of a contest or contestants) not fairly matched as opponents):

mismatched

WordNet sense 5 (poorly balanced or matched in quantity or value or measure):

unequal

WordNet sense 6 (lacking consistency):

scratchy, spotty

WordNet sense 7 (displaying a lack of consistency):

inconsistent