uneven

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Not equal, as in size, length, or quality.
• adjective Having ill-matched opponents.
• adjective Not consistent or uniform.
• adjective Not smooth or level.
• adjective Not straight or parallel.
• adjective Of, relating to, or being an odd number.
• adjective Obsolete Not fair or equitable.

from The Century Dictionary.

• Not even.
• Not perfectly horizontal or level, as the beam of a scale; not at the same height or on the same plane; hence, not fair, just, or true.
• In arithmetic, odd; not divisible by 2 without a remainder: as, 3, 5, 7, etc., are uneven numbers.
• Ill-matched; unsuitable; ill-assorted.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Not even; not level; not uniform; rough.
• adjective Not equal; not of equal length.
• adjective Not divisible by two without a remainder; odd; -- said of numbers.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Not even
• adjective Not level or smooth
• adjective Not uniform
• adjective Varying in quality

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective variable and recurring at irregular intervals
• adjective lacking consistency
• adjective (of a contest or contestants) not fairly matched as opponents
• adjective not divisible by two
• adjective not even or uniform as e.g. in shape or texture