uneven  
adjective uk/ʌnˈiː.vən/ us/ʌnˈiː.vən/
  (NOT EVEN)      
 C2 不平整的;参差不齐的;不平等的;不平坦的;不连续的
not level, equal, flat, or continuous
  Be careful on that path - the paving stones are uneven. 走那条路时要小心——铺路石很不平。 
 There is an uneven distribution of wealth across the country from the north to the south. 全国的财富分配南北很不均衡。 
 The contest was very uneven - the other team was much stronger than us. 比赛很不平等——对方参赛队的实力比我们强很多。 
 - More examples
 - The patient's breathing was quick and uneven.
 - The uneven floorboards creaked when you walked across them.
 - His teeth were yellow and uneven.
 - an uneven distribution of financial resources
 - Their rates of development are uneven.
 
  (NOT GOOD)      
 (质量)不稳定的,时好时坏的
different in quality; often used to avoid saying bad
  Your work has been a little uneven this term, Matthew. 马修,你的功课这学期很不稳定。