insignificant       
adjective uk/ˌɪn.sɪɡˈnɪf.ɪ.kənt/ us/ˌɪn.sɪɡˈnɪf.ə.kənt/
C1 不重要的,无足轻重的
small or not noticeable, and therefore not considered important 
  Why bother arguing about such an insignificant amount of money? 为什么为那点小钱争吵? 
 The difference between the two results was insignificant. 两个结果之间的差别无足轻重。