uneven (adj.)

Old English unefen "unequal, unlike, anomalous, irregular," from un- (1) "not" + even (adj.). Similar formation in Old Frisian oniovn, Middle Dutch oneven, Old High German uneban, German uneben, Old Norse ujafn. Meaning "broken, rugged" (in reference to terrain, etc.) is recorded from late 13c. Related: Unevenly; unevenness.

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Definitions of uneven from WordNet

uneven (adj.)
not even or uniform as e.g. in shape or texture;
wood with an uneven grain
an uneven color
uneven margins
uneven ground
uneven (adj.)
(of a contest or contestants) not fairly matched as opponents;
vaudeville...waged an uneven battle against the church
Synonyms: mismatched
uneven (adj.)
variable and recurring at irregular intervals;
uneven spacing
an uneven gait
uneven (adj.)
lacking consistency;
Synonyms: spotty / scratchy
uneven (adj.)
not divisible by two;
Synonyms: odd